Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] NTX-1 Facility NTX Facility [Member] NTX facility member. Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Book Value Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Weighted average interest rate Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Pledged Status [Axis] Pledged Status [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Real Estate [Line Items] Real Estate [Line Items] Segment Reporting [Abstract] Payable for investments purchased Payable, Investment, Purchase Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Total Count Number Of Collateralized Loans Number of collateralized loans. 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Loans Receivable Based on Internal Risk Ratings [Table] Loans Receivable Based On Internal Risk Ratings [Table] Loans Receivable Based On Internal Risk Ratings [Table] Common Stock Class M Class M Common Class M [Member] Common Class M. Total Real Estate Investment Property, at Cost Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Weighted Average - Maturity (years) Debt Securities, Available For Sale, Weighted Average Remaining Duration Debt Securities, Available For Sale, Weighted Average Remaining Duration Amortized Cost Basis Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Receivables [Abstract] Statement of Financial Position [Abstract] Deferred Financing Costs Deferred Financing Costs [Policy Text Block] Deferred financing costs. Total Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Senior Loans Senior Loans [Member] Deconsolidation of securitization trusts Deconsolidation Of Securitization Trusts Deconsolidation Of Securitization Trusts Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Annualized hurdle rate Annualized Hurdle Rate Annualized hurdle rate. 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Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Repayments under credit facilities Repayments of Lines of Credit Public offering Organization And Offering Expenses Reimbursement As Percentage Of Gross Proceeds From Public Offering Organization and offering expenses reimbursement as percentage of gross proceeds from public offering. 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Schedule of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] 1-3 years Held To Maturity Securities Debt Maturities Rolling Year Two Through Three Fair Value Held to maturity securities debt maturities rolling year two through three fair value. Net book value of loans receivable by year of origination, current fiscal year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Credit Facility [Domain] Credit Facility [Domain] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Amortized cost of loans, non-accrual status Financing Receivable, Nonaccrual Mixed Use Mixed Use [Member] Mixed-Use Distributions paid per share of common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Depreciable Life Property, Plant, and Equipment, Useful Life Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Total sources of distributions Dividends Deconsolidation of securitization trusts Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Deconsolidation of Securitization Trusts Fair value measurement with unobservable inputs reconciliation recurring basis asset deconsolidation of securitization trusts. 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Number of revolving credit facilities Number Of Revolving Credit Facilities Number Of Revolving Credit Facilities Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Borrowings under repurchase agreements Borrowings Of Repurchase Agreement Borrowings of repurchase agreement. Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Off-Balance-Sheet, Credit Loss, Liability [Roll Forward] Off-Balance-Sheet, Credit Loss, Liability [Roll Forward] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Net unrealized (gain) loss on mortgage-backed securities, fair value option Net Unrealized (Gain) Loss On Mortgage-Backed Securities, Fair Value Option Net Unrealized (Gain) Loss On Mortgage-Backed Securities, Fair Value Option Offering Costs Offering Costs [Policy Text Block] Disclosure of accounting policy for offering costs. Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Mortgage Backed Securities Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Stockholder distributions paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Real Estate [Table] Real Estate [Table] Gross Unrecognized Holding Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] Add: Expense recoupment to sponsor Expense Recoupment To Sponsor Expense Recoupment To Sponsor Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Building and building improvements Building and Building Improvements [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Issuance of common stock Proceeds from Issuance of Common Stock Finance Blue Facility Finance Blue Facility [Member] Finance Blue Facility 2024-FL9 Notes 2024-FL9 Two Zero Two Four FL9 Notes [Member] Two Zero Two Four FL9 Notes Administrative service fee percentage Percentage Of Administrative Service Fee Equivalent To Net Asset Value Percentage of administrative service fee equivalent to net asset value. Distributions: Dividends, Common Stock [Abstract] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Percentage of origination fees of loan amount Percentage Of Origination Fees Of Loan Amount Percentage of origination fees of loan amount.. Modifications accounted for as repayments and new loans Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification 2027 Lessor, Operating Lease, Payment to be Received, Year One Included in other comprehensive income Fair value of assets still held in unrealized gain loss recognized in other comprehensive income Fair Value of assets still held in unrealized gain loss recognized in other comprehensive income FS Real Estate Advisor Fs Real Estate Advisor [Member] Fs real estate advisor. 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Entity Central Index Key Entity Central Index Key Hospitality Hospitality [Member] Hospitality Additional paid-in capital Additional Paid in Capital, Common Stock Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Repayments under repurchase agreements Repayments Of Repurchase Agreements Repayments Of Repurchase Agreements. Dividend rate Preferred Stock, Dividend Rate, Percentage Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward] Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Percentage of share repurchase received Percentage Of Share Repurchase Received Percentage Of Share Repurchase Received Period of written notice to the company by the adviser entities Period Of Written Notice To The Company By The Adviser Entities Period Of Written Notice To The Company By The Adviser Entities Common Stock Class I Class I Common Class I [Member] Common Class I. Weighted Average Spread Debt Instrument, Basis Spread on Variable Rate Not Placed On Non Accrual Status Not Placed On Non Accrual Status [Member] Not Placed On Non Accrual Status Schedule of Cash Distributions Per Share that Paid on its Common Stock Schedule of Dividends Payable [Table Text Block] Variable Rate [Domain] Variable Rate [Domain] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Transfer of investments in real estate, held-for-sale to investments in real estate, held-for-investment Transfer Of Investments In Real Estate, Held-For-Sale To Investments In Real Estate, Held-For-Investment Transfer Of Investments In Real Estate, Held-For-Sale To Investments In Real Estate, Held-For-Investment Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Less than 1 year Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Statement [Line Items] Statement [Line Items] Financial Receivable, Non Accrual Status [Domain] Financial Receivable, Non Accrual Status [Domain] Financial Receivable, Non Accrual Status [Domain] Total assets Total assets Assets Less: Interest expense Interest Expense, Operating Transfer to investments in real estate, net Financing Receivable, Transfer To Real Estate, Net Financing Receivable, Transfer To Real Estate, Net Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] BB-1 Facility BARCLAYS BANK PLC [Member] Repayment of collateralized loan obligations Repayment Of Collateralized Loan Obligations Repayment of collateralized loan obligations. Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax PEO PEO [Member] 2028 Long-Term Debt, Maturity, Year Two Debt instrument credit spread adjustment Debt Instrument Credit Spread Adjustment Debt instrument credit spread adjustment. Mezz Loan Second Mortgage [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Debt securities available for sale unrealized loss positions number of positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Land and land improvements Land and Land Improvements [Member] Retained Earnings (Accumulated Deficit) Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facilities Revolving Credit Facility [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Balance at beginning of period (in shares) Balance at end of period (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Carrying Amount, Face Amount, and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Net income per share of common stock - diluted (in dollars per share) Earnings Per Share, Diluted Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Thereafter Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Outstanding Face Amount Debt Securities, Trading, Face Value Debt Securities, Trading, Face Value Net book value of loans receivable by year of origination, three year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Schedule of Loan Receivables Acquired by Geographic Locations Schedule of Loan Receivables Acquired By Geographic Locations [Table Text Block] Schedule of Loan Receivables Acquired By Geographic Locations Disclosure in Tabular Form of Number of Collateral Loans and Principal Amount of Obligation [Table] Disclosure In Tabular Form Of Number Of Collateral Loans And Principal Amount Of Obligation [Table] Disclosure in tabular form of number of collateral loans and principal amount of obligation. Amount Available Line of Credit Facility, Remaining Borrowing Capacity Real estate operating expenses Other Revenue (Expense) from Real Estate Operations Exit and extension fees received on loans receivable, held-for-investment Exit and extension fees received on loans receivable Proceeds From Extension Fee On Loans Receivable Proceeds from extension fee on loans receivable. 2021-FL3 Notes 2021-FL3 Two Zero Two One FL3 Notes [Member] Two Zero Two One F L3 Notes. Benchmark Rate Benchmark Rate [Member] Benchmark rate member. Financial Assets Financial Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] (Increase) decrease on securities with previously recorded credit losses Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) Repurchases of common stock Repurchases of common stock Shares repurchased under repurchase plan, value Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Additions on securities for which credit losses were not previously recorded Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded Interest payable Increase (Decrease) in Interest Payable, Net Credit facilities payable, net Credit Facilities Payable Credit Facilities Payable Sales and repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Schedule of Repayment for Secured Financings Outstanding Schedule of Maturities of Long-Term Debt [Table Text Block] Sale of Stock [Axis] Sale of Stock [Axis] Multifamily Multifamily Multifamily [Member] WF-1 Facility Wells Fargo Facility-1 [Member] WF-1 Facility. Valuation Services Fees Valuation Services Expense Valuation Services Expense Mortgage loans held in securitization trusts, at fair value Mortgage Loans Held In Securitization Trusts [Member] Mortgage loans held in securitization trusts. Allowance for Credit Losses Debt Securities, Trading, Allowance for Credit Loss Debt Securities, Trading, Allowance for Credit Loss Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Investments owned Investment Owned, Fair Value Agreement [Axis] Agreement [Axis] Agreement axis. Administrative Services Fee Administrative Fees Expense South South [Member] South [Member] Schedule of Financing Receivable, Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Fair value at beginning of period Fair value at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Common Stock Class D Class D Common Class D [Member] Common Class D. Securities with a loss greater than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Class of Stock [Line Items] Class of Stock [Line Items] Other expenses Noninterest Expense [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Thereafter Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Two Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Principals of FS Investments Principals Of FS Investments [Member] Principals Of FS Investments San Francisco, CA San Francisco, CA [Member] San Francisco, CA Termination Date Trading Arrangement Termination Date Subsequent Events [Abstract] Performance contingent rights issued Performance Contingent Rights Performance contingent rights. Selling commission and fee maximum percent Related Party Transactions Selling Commission And Fee Maximum percent Related Party Transactions Selling Commission And Fee Maximum percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Transfers in or out (in shares) Stock Issued During Period Shares Conversion Of Class The number of shares issued during the period upon the conversion of class. Accrued unrecognized interest or penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Available-for-Sale an Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] RBC Facility R B C Facility [Member] R B C Facility. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Retail Retail Site [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Class I Share Performance-contingent Rights Agreement Class I Share Performance-Contingent Rights Agreement [Member] Class I Share Performance-Contingent Rights Agreement Securities with a loss less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Financing receivable, modified amount Financing Receivable, Excluding Accrued Interest, Modified, Accumulated Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Debt securities, available-for-sale, nonaccrual Debt Securities, Available-For-Sale, Nonaccrual Debt Securities, Available-For-Sale, Nonaccrual Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Losses [Roll Forward] "Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Losses [Roll Forward] "Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Losses Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Transfers in or out Stock Issued During Period Value Conversion Of Class Value of stock issued during the period upon the conversion of class. Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Furniture, fixtures and equipment Furniture, fixtures and equipment Furniture and Fixtures [Member] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Award Type [Domain] Award Type [Domain] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Asset Pledged as Collateral Asset Pledged as Collateral [Member] 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Transfer of loans receivable held-for-investments to investments in real estate, held-for-sale Transfer Of Loans Receivable Held-for-Investment To Investments In Real Estate Held-for-Sale Transfer Of Loans Receivable Held-for-Investment To Investments In Real Estate Held-for-Sale Geographical [Axis] Geographical [Axis] Summary of Derivative Instruments [Abstract] Restricted cash Restricted cash Restricted cash Restricted Cash Total Lessor, Operating Lease, Payment to be Received Mortgage-backed securities held-to-maturity, credit loss allowances Credit Loss Allowance CECL Reserve as Beginning balance CECL reserve as of Ending balance Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Other assets Other assets Other Assets BMO-1 Facility BMO1Facility [Member] BMO-1 facility. 30-59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Other income (loss) Noninterest Income [Abstract] Percentage of reimbursement revenue Percentage Of Reimbursement Revenue Percentage of reimbursement revenue. Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Upfront dealer manager fees percentage Related Party Transactions Up front Dealer Manager Fees Percentage Related party transactions up front dealer manager fees percentage. 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Adjustment to Compensation: Adjustment to Compensation [Axis] Performance contingent rights issued Adjustments To Additional Paid In Capital Performance Contingent Rights Issued Adjustments To Additional Paid In Capital Performance Contingent Rights Issued Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends Payable [Table] Dividends Payable [Table] Self Storage Self Storage [Member] Self Storage [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Payments of interest Interest Paid, Excluding Capitalized Interest, Operating Activity 60-89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Performance Fee Performance Fee Expense Performance fee expense. Credit Facility [Axis] Credit Facility [Axis] Total Assets, Fair Value Disclosure Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Additional Paid-In Capital Additional Paid-in Capital [Member] Loans Receivable Financing Receivable [Policy Text Block] Schedule of Number of Loans and the Principal Balance Disclosure In Tabular Form Of Number Of Collateral Loans And Principal Amount Of Obligation [Table Text Block] Disclosure in tabular form of number of collateral loans and principal amount of obligation table text block. Interest receivable Interest receivable Interest Receivable Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Measurement Input, Expected Term Measurement Input, Expected Term [Member] Less: Interest expense on mortgage obligations issued by securitization trusts Interest Expense On Mortgage Obligations Issued By Securitization Trusts Interest expense on mortgage obligations issued by securitization trusts. Disclosure in Tabular Form of Number of Collateral Loans and Principal Amount of Obligation [Line Items] Disclosure In Tabular Form Of Number Of Collateral Loans And Principal Amount Of Obligation [Line Items] Disclosure in tabular form of number of collateral loans and principal amount of obligation. Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Real estate depreciation and amortization Depreciation, Depletion and Amortization Hurdle rate on average adjusted capital Hurdle Rate Average Adjusted Capital Hurdle rate average adjusted capital. SOFR Secured Overnight Financing Rate (SOFR) [Member] Stockholders servicing fee percentage on aggregate NAV of outstanding shares Servicing Fee Percentage On Aggregate Net Asset Value Of Outstanding Shares Servicing fee percentage on aggregate net asset value of outstanding shares. Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Real Estate [Abstract] Accrued stockholder servicing fee Accrued Stockholders Servicing Fee Payable To Related Party For Stockholders Servicing Fees. Non-PEO NEO Non-PEO NEO [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Net other expenses Noninterest Expense Variable rate Variable Rate Variable Rate Award Timing Method Award Timing Method [Text Block] Total increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Number of loans Number of Loans Financing Receivable, Number Of Loans Financing receivable, number of loans. 2028 Lessor, Operating Lease, Payment to be Received, Year Two Net income Net income Net income Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Fair Value Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Gross unrealized gains Debt Securities, Trading, Accumulated Gross Unrealized Gain, Before Tax Debt Securities, Trading, Accumulated Gross Unrealized Gain, Before Tax Measurement input Loan Collateral Fair Value, Measurement Input Loan Collateral Fair Value, Measurement Input Real estate operating income Profit (Loss) from Real Estate Operations Payment for management fees Payment for Management Fee Schedule of Cash Distribution on Class of Common Stock Schedule Of Dividends Declared And Paid [Table Text Block] Schedule Of Dividends Declared And Paid Table [Text Block]. Net unrealized gain (loss) on mortgage loans and obligations held in securitization trusts, net Net unrealized (gain) loss on mortgage loans and obligations held in securitization trusts Unrealized Gain (Loss) On Mortgage Loans And Obligations Held In Securitization Trusts, Net Unrealized gain (loss) on mortgage loans and obligations held in securitization trusts, net. Rialto Rialto Capital Management [Member] Rialto capital management member. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Percentage of share repurchases of aggregate net asset value Percentage Of Share Repurchases Of Aggregate Net Asset Value Percentage Of Share Repurchases Of Aggregate Net Asset Value Accrued stockholder servicing fees Stock Issued During Period, Value, Issued for Services Document Fiscal Year Focus Document Fiscal Year Focus 5 Risk Rating, 5 Risk Level, Very High [Member] Risk Level Very High [Member] Restricted stock units issued Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Adjustments to additional paid in capital share based compensation restricted stock units. Common stock Common Stock, Value, Issued SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Category [Domain] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Category [Domain] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date MM-1 Facility Massachusetts Mutual Lic [Member] Massachusetts Mutual Lic Member. Outstanding Face Amount Debt Securities, Available-For-Sale, Face Value Debt Securities, Available-For-Sale, Face Value Credit Loss Profile [Axis] Credit Loss Profile [Axis] Credit Loss Profile Industrial Industrial Property [Member] In-place lease intangibles Leases, Acquired-in-Place [Member] Loans Receivable, net Financing Receivables [Text Block] Common Stock Class Y Class Y Common Class Y [Member] Common Class Y. Amendment Flag Amendment Flag Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] 2021-FL2 Notes 2021-FL2 Two Zero Two One FL2 Notes [Member] Two Zero Two One F L2 Notes Member. Accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Investments in real estate, held-for-investment Real Estate, Held-for-Investment Real Estate, Held-for-Investment 3-5 years Held To Maturity Securities Debt Maturities Rolling Year Four Through Five Fair Value Held to maturity securities debt maturities rolling year four through five fair value. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfer into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Entity Address, State or Province Entity Address, State or Province Total Loans Financing Receivable, Excluding Accrued Interest, Nonaccrual PEO Total Compensation Amount PEO Total Compensation Amount Weighted average common stock outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Fees and Expenses Accrued Under Advisory Agreement Schedule of Related Party Transactions [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Common Stock Class T Class T Common Class T [Member] Common Class T. Schedule of Debt Securities, Available-for-Sale, Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Principal repayments of mortgage-backed securities, held-to-maturity Principal Repayments Of Mortgage-Backed Securities, Held-To-Maturity Principal Repayments Of Mortgage-Backed Securities, Held-To-Maturity Gross unrealized losses Debt Securities, Trading, Accumulated Gross Unrealized Loss, before Tax Debt Securities, Trading, Accumulated Gross Unrealized Loss, before Tax Investment In Real Estate, Held-for-Sale, Transferred To Held-for-Investment Investment In Real Estate, Held-for-Sale, Transferred To Held-for-Investment [Member] Investment In Real Estate, Held-for-Sale, Transferred To Held-for-Investment Offering costs paid Payments For Initial Public Offering Costs Payments for Initial Public offering Costs. Interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Total other income (loss) Noninterest Income Credit loss expense, net Provisions For Credit Loss Expense (Reversal) Provisions For Credit Loss Expense (Reversal) Principal repayments of mortgage loans held in securitization trusts at fair value Principal Repayments Of Mortgage Loans Held In Securitization Trusts At Fair Value Principal Repayments Of Mortgage Loans Held In Securitization Trusts At Fair Value Average borrowings Long-Term Debt, Average Amount Outstanding Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Annualized core earnings rate Annualized Core Earnings Annualized core earnings. Net income attributable to FS Credit Real Estate Income Trust, Inc. Net income attributable to FS Credit Real Estate Income Trust, Inc. Net Income (Loss) Available to Common Stockholders, Basic Debt Securities, Held-to-Maturity [Table] Debt Securities, Held-to-Maturity [Table] Proceeds from distribution reinvestment plan Reinvestment of distributions Stock Issued During Period, Value, Dividend Reinvestment Plan 2026-FL11 Notes 2026-FL11 Two Zero Two Six FL11 Notes [Member] Two Zero Two Six FL11 Notes Dividends on preferred stock Dividends, Preferred Stock Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Loans receivable, held-for-investment, net of credit loss allowances of $69,864 and $77,270 Net book value Loans receivable, net Loans receivable, held-for-investment Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net change in unrealized gain (loss) on mortgage-backed securities, fair value option Net Change In Unrealized Gain (Loss) On Mortgage-backed Securities Fair Value Option Net Change In Unrealized Gain (Loss) On Mortgage-backed Securities Fair Value Option Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Quarterly core earnings rate Core Earnings Core earnings. Fair Value of Collateral Financial Instruments, Owned, at Fair Value Interest rate cap Interest Rate Derivative Assets, at Fair Value Valuation fee, per valuation Valuation Services Expense, Per Valuation Valuation Services Expense, Per Valuation Reinvestment of distributions (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Net book value Long-Term Debt MS-1 Facility MS Facility [Member] MS facility member. Net book value of loans receivable by year of origination, two year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Changes in assets and liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Class E Notes Mortgage Backed Securities Class E Notes Mortgage Backed Securities [Member] Class E notes mortgage backed securities. Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Stockholders' Equity Equity [Text Block] Amortized Cost Basis Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Dealer stockholders servicing fee percentage on aggregate NAV of outstanding shares Dealer Stockholder Servicing Fee Percentage On Aggregate Net Asset Value Of Outstanding Shares Dealer stockholder servicing fee percentage on aggregate net asset value of outstanding shares. Lucid Facility Lucid Facility [Member] Lucid Facility. Investments in real estate, held-for-sale Investments in real estate, carrying amount Real Estate, Held-for-Sale Agreement [Domain] Agreement [Domain] Agreement Securities with a loss greater than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Schedule of Useful Lives of Investments in Real Estate Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Schedule of Real Estate Properties Schedule of Real Estate Properties [Table Text Block] Repurchase Agreements Repurchase Agreements [Member] Net interest income Interest Income (Expense), Operating [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Mortgage-backed securities held-to-maturity Debt Security, Mortgage-Backed, Held-to-Maturity, Fair Value Disclosure Geographical [Domain] Geographical [Domain] Percentage of minimum operating expenses to be waived or paid Percentage Of Minimum Operating Expenses To Be Waive Reimbursement Or Paid Percentage of minimum operating expenses to be waive reimbursement or paid. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Weighted Average - Coupon Debt Securities, Trading, Weighted Average Cash Coupon Rate Debt Securities, Trading, Weighted Average Cash Coupon Rate Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Amortization of deferred financing costs and discount Amortization of Debt Issuance Costs and Discounts Net change in unrealized gain (loss) on interest rate cap Net unrealized (gain) loss on valuation of interest rate cap Unrealized Loss Unrealized Gain (Loss) on Derivatives Interest expense on real estate Interest Expense On Real Estate Interest Expense On Real Estate Reinvestment of stockholder distributions Reinvested in shares Stock Issued During Period Value Dividend Reinvestment Plan Cash Impact Stock Issued During Period Value Dividend Reinvestment Plan Cash Impact Repurchase of shares to combined net asset value of classes of shares limit percentage Repurchase Of Shares To Combined Net Asset Value Of Classes Of Shares Limit Percentage Repurchase of shares to combined net asset value of classes of shares limit percentage. Interest income on mortgage loans held in securitization trusts Interest and Fee Income, Loan, Held-for-Sale, Mortgage Amount Outstanding Total Face value Long-Term Debt, Gross Asset Class [Domain] Asset Class [Domain] Related Party Transactions [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average common stock outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Credit loss expense, net Allowance For Credit Losses Increase Decrease Allowance For Credit Losses Increase Decrease. Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] Advisor stockholders servicing fee percentage on aggregate NAV of outstanding shares Advisor Stockholder Servicing Fee Percentage On Aggregate Net Asset Value Of Outstanding Shares Advisor stockholder servicing fee percentage on aggregate net asset value of outstanding shares. Derivative Instruments Derivatives, Policy [Policy Text Block] Loans receivable at beginning of period Total loans receivable Total loans receivable Net Book Value Total Amortized Cost Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Underlying Security Market Price Change Underlying Security Market Price Change, Percent Collateralized Loan Obligations, Real Estate Collateralized Loan Obligations, Real Estate [Member] Collateralized Loan Obligations, Real Estate More than 5 years Held To Maturity Securities Debt Maturities Rolling After Five Years Fair Value Held to maturity securities debt maturities rolling after five years fair value. Borrowings under credit facilities Proceeds from Lines of Credit Derivative Instrument Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross Unrecognized Holding Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss 4 Risk Level, High [Member] Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Increase (Decrease) in CECL reserve Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Distribution Reinvestment Plan Distribution Reinvestment Plan [Member] Distribution reinvestment plan. Debt Securities, Available-for-Sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Receivable for investments sold and repaid Receivable For Investment Sold And Repaid Receivable for investment sold and repaid. Organization, Consolidation and Presentation of Financial Statements [Abstract] Notional Amount Derivative Asset, Notional Amount Capitalization Rate Measurement Input, Cap Rate [Member] 2025-FL10 Notes 2025-FL10 Two Zero Two Five FL10 Notes [Member] Two Zero Two Five FL10 Notes All Executive Categories All Executive Categories [Member] Weighted-average maximum maturity (years) Loan Maturity Period Loan maturity period. Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Midwest Midwest [Member] Midwest [Member] Percentage Percentage Percentage Of Carrying Amount Of Mortgage Loans Percentage of carrying amount of mortgage loans. Amortized Cost Basis Debt Securities, Trading, Amortized Cost Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] WF-2 Facility Wells Fargo Facility-2 [Member] Wells Fargo Facility-2 Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Liabilities Liabilities Liabilities [Abstract] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Common Stock Class F Class F Common Class F [Member] Common Class F. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Stockholder servicing fees paid Payment To Related Party For Stockholders Servicing Fees Payment To Related Party For Stockholders Servicing Fees Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Schedule of Loans Receivable Based on Internal Risk Ratings Loans Receivable Based On Internal Risk Ratings [Table Text Block] Loans receivable based on internal risk ratings. Other liabilities Other liabilities Other Liabilities Distributions declared Total distributions Cash flows from operating activities Dividends, Common Stock Offering costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Unrealized loss, related to mortgage loan held in securitization trusts Unrealized Loss On Mortgage Loans And Obligations Held In Securitization Trusts At Fair Value Unrealized Loss On Mortgage Loans And Obligations Held In Securitization Trusts At Fair Value Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Offering costs previously funded Payments To Related Party For Offering Costs Previously Funded Payments to related party for offering costs previously funded. Investments in real estate, held-for-investment Real Estate Investment Property, Net Primary Offering Primary Offering [Member] Primary offering. Schedule of Held-to-Maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] Schedule of Net Book Value of Debt Instrument Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price Mortgage-backed securities held-to-maturity, net of credit loss allowances of $0 and $59 Net Carrying Amount Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Offering costs incurred Offering Costs Offering costs. Performance fee percentage Performance Fee, Percentage Of Core Earnings Performance Fee, Percentage Of Core Earnings Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Restricted stock units Restricted Stock or Unit Expense Common Stock Common Stock Including Additional Paid in Capital [Member] Loan repayments Proceeds from Collection of Finance Receivables Interest payable Interest payable Interest Payable Management fee Base Management Fee Management Fee Expense Mortgage note payable Mortgage Loans Payable Fair Value Disclosure Mortgage loans payable fair value disclosure. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Real Estate Real Estate Disclosure [Text Block] Equity Component [Domain] Equity Component [Domain] Net realized gain (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] Real Estate Properties [Domain] Real Estate Properties [Domain] Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Distribution, percent funded by cash flows from operating activities Dividend Distribution, Percent Funded By Cash Flows From Operating Activities Dividend Distribution, Percent Funded By Cash Flows From Operating Activities Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Fair Value Debt Securities, Held-to-Maturity, Fair Value Interest income Interest Income, Operating Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Schedule of Information of Outstanding Financing Arrangement Schedule of Line of Credit Facilities [Table Text Block] Loans receivable, held-for-investment Loans Held For Investment Fair Value Disclosure Loans held for investment fair value disclosure. Less: Expense limitation Investment Company, Contractual Fee Waived Loans Receivable Based on Internal Risk Ratings [Line Items] Loans Receivable Based On Internal Risk Ratings [Line Items] Loans Receivable Based On Internal Risk Ratings [Line Items] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Weighted Average Weighted Average [Member] Underlying Asset Class [Axis] Underlying Asset Class [Axis] All Adjustments to Compensation All Adjustments to Compensation [Member] Aggregate proceeds from private placement Proceeds from Issuance of Private Placement Income Taxes Income Tax, Policy [Policy Text Block] Net cash provided by (used in) operating activities Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Stockholders' equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Expired Amount Recoupment Expired Amount Recoupment Expired Amount Weighted-average cash coupon Weighted Average Cash Coupon Rate Weighted Average Cash Coupon Rate Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Amount of Expense Reimbursement Expense Reimbursement Expense reimbursement. City Area Code City Area Code Document Information [Table] Document Information [Table] Subsequent Events Subsequent Events [Text Block] Repurchase agreements Debt Instrument, Fair Value Disclosure Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] JP-1 Facility JP-1 Facility [Member] JP-1 Facility Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] FS Investment Solutions FS Investment Solutions [Member] FS investment solutions. Mortgage loans held in securitization trusts, at fair value Mortgage loans held in securitization trusts, at fair value Mortgage loans held in securitization trusts, at fair value Loan, Mortgage, Held-for-Sale, Fair Value Disclosure Amortization of deferred fees on loans and debt securities Amortization Of Deferred Fees On Loans And Debt Securities Amortization of deferred fees on loans and debt securities. Award non vesting rights, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award NonVesting Rights, Percentage Share-based compensation arrangement by share-based payment award, award nonvesting rights, percentage . CB-1 Facility CB1 Facility [Member] CB1 Facility Other assets Increase (Decrease) in Other Operating Assets Stock Issued During Period, Shares, New Issues Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues Measurement Basis [Axis] Measurement Basis [Axis] Collateralized loan obligations, net Collateralized loan obligations Collateralized loan obligations, net Collateralized Loan Obligation Collateralized loan obligation. Performance fees payable Performance Fees Payable Performance Fees Payable Subsequent Event Type [Domain] Subsequent Event Type [Domain] Series A Preferred Stock Series A Preferred Stock [Member] Weighted Average - Maturity (years) Debt Securities, Trading, Weighted Average Remaining Duration Debt Securities, Trading, Weighted Average Remaining Duration Stockholder Servicing Fees Stockholders' Equity, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Net change in unrealized gain (loss) on mortgage-backed securities available-for-sale OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Adjustments to reconcile net income to net cash provided by (used in) operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Derivative liability weighted average blended yield term Derivative Liability Weighted Average Blended Yield Term Derivative liability weighted average blended yield term. Common stock, price per share (in dollars per share) Shares Issued, Price Per Share Financial Instruments [Domain] Financial Instruments [Domain] Net unrealized gain (loss) on real estate, held-for-sale Net unrealized (gain) loss on real estate, held-for-sale Unrealized Gain (Loss) On Real Estate Held-for-Sale Unrealized Gain (Loss) On Real Estate Held-for-Sale Net book value of loans receivable by year of origination, four year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Common stock issued Issuance of common stock Stock Issued During Period, Value, New Issues Common Stock Class S Class S Common Class S [Member] Common Class S. Related Party Transaction [Table] Related Party Transaction [Table] GS-1 Facility Goldman Sachs Facility [Member] Goldman sachs facility. Total CECL reserve Beginning Balance Ending Balance Off-Balance-Sheet, Credit Loss, Liability Mortgage obligations issued by securitization trusts, at fair value Mortgage obligations issued by securitization trusts, at fair value Mortgage obligations issued by securitization trusts, at fair value Mortgage Obligations Issued By Securitization Trusts Fair Value Disclosure Mortgage obligations issued by securitization trusts fair value disclosure. Schedule of Available-for-Sale Securities Reconciliation Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Mortgage-backed Securities Marketable Securities, Policy [Policy Text Block] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Securities with a loss less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Schedule of Financial Assets and Liabilities Carried at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Increase (decrease) in general CECL reserve Specific CECL Reserve Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Derivative [Line Items] Derivative [Line Items] Repurchases of common stock (in shares) Repurchases of common stock (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Distributions declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Office Office Building [Member] Aurora, CO Aurora, CO [Member] Aurora, CO Schedule of Maturities of Investment Held-to-Maturity CMBS Investments Classified by Contractual Maturity Date [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Schedule of Detailed Information About the Assets and Liabilities Schedule of Variable Interest Entities [Table Text Block] Debt securities, available-for-sale, nonaccrual, number of commercial mortgage-backed securities Debt Securities, Available-For-Sale, Nonaccrual, Number Of Securities Debt Securities, Available-For-Sale, Nonaccrual, Number Of Securities Thereafter Lessor, Operating Lease, Payment To Be Received, After Year Four Lessor, Operating Lease, Payment To Be Received, After Year Four Non-accrual loans, interest rate used to calculate weighted average all-in yield rate Non-Accrual Loans, Interest Rate Used To Calculate Weighted Average All-In Yield Rate Non-Accrual Loans, Interest Rate Used To Calculate Weighted Average All-In Yield Rate Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Senior Loan First Mortgage [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Unamortized discount Debt Instrument, Unamortized Discount Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Term of extension period (in years) Debt Instrument, Extension Period Debt Instrument, Extension Period Recoupable Amount Recoupable Amount Recoupable amount. Current or Less Than 30 Days Past Due Financial Asset, Not Past Due And 1 to 29 Days Past Due [Member] Financial Asset, Not Past Due And 1 to 29 Days Past Due Net interest income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type Arlington, TX Arlington, TX [Member] Arlington, TX Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Mortgage-backed securities, at fair value, credit loss allowances Allowance for Credit Losses Allowance for credit losses at beginning of period Allowance for credit losses at ending of period Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Affiliate Of Rialto Affiliate Of Rialto [Member] Affiliate Of rialto member. Recoupment paid or payable to sponsor Recoupment Paid Or Payable Recoupment Paid Or Payable. Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Period for which reimbursement payable Period For Which Reimbursement Payable Period for which reimbursement payable. Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Local Phone Number Local Phone Number Pledged Status [Domain] Pledged Status [Domain] Commitments and contingencies (See Note 11) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Executive Category: Executive Category [Axis] Dealer manager upfront selling commissions fees percentage Related Party Transaction Dealer Manager Upfront Selling Commissions Related party transaction dealer manager upfront selling commissions. Counterparty Name [Axis] Counterparty Name [Axis] 2030 Lessor, Operating Lease, Payment to be Received, Year Four Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Variable Interest Entity [Table] Variable Interest Entity [Table] Supplemental disclosure of cash flow information and non-cash financial activities Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Repurchase of shares to NAV of all classes of shares, percentage Repurchase Of Shares To Combined Net Asset Value Of Classes Of Shares Percentage Repurchase of shares to combined net asset value of classes of shares percentage. Mortgage-backed securities, at fair value, credit loss allowances of $23,813 and $23,895 Mortgage-backed securities, at fair value Debt Security, Mortgage-Backed, Available-for-Sale, Fair Value Disclosure Financial Liabilities Financial Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Reimbursement due from (due to) sponsor Increase (Decrease) in Due from Related Parties Entity Tax Identification Number Entity Tax Identification Number Schedule of Nonaccrual Loan Receivable Past Due Financing Receivable, Past Due [Table Text Block] Revenue Recognition Revenue [Policy Text Block] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Stockholder servicing fees percentage Servicing Fees Threshold Percentage Servicing fees threshold percentage. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Principal Business and Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Origination and fundings of loans receivable Payments for (Proceeds from) Loans and Leases Net income per share of common stock - basic (in dollars per share) Earnings Per Share, Basic 3 Risk Level, Medium [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Due to related party Increase (Decrease) in Due to Related Parties Insider Trading Arrangements [Line Items] Payment of deferred financing costs Payments of Financing Costs Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Asset Pledged as Collateral without Right Asset Pledged as Collateral without Right [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Sandy Springs, GA Sandy Springs, GA [Member] Sandy Springs, GA Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Payable for shares repurchased Payable for shares repurchased Payable For Shares Repurchased Payable for shares repurchased. Cover [Abstract] Cash, cash equivalents and restricted cash Cash And Cash Equivalents And Restricted Cash Fair Value Disclosure Cash and cash equivalents and restricted cash, fair value disclosure. Equity Awards Adjustments Equity Awards Adjustments [Member] Mortgage loans held in securitization trusts, at fair value Mortgage loans held in securitization trusts, at fair value [Member] Mortgage loans held in securitization trusts, at fair value Common stock value submitted for approval under initial public offering Common Stock Value Submitted For Approval Under Initial Public Offering Common Stock Value Submitted For Approval Under Initial Public Offering Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Future Minimum Lease Payments Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Other liabilities Increase (Decrease) in Other Operating Liabilities Underlying Asset Class [Domain] Underlying Asset Class [Domain] Schedule of Details Overall Statistics for Loans Receivable Portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Derivative liability, measurement input Derivative Liability, Measurement Input FS Real Estate Advisor or Rialto FS Real Estate Advisor and Rialto [Member] FS Real Estate Advisor and Rialto. General and administrative expenses General and Administrative Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Weighted-average all-in yield Weighted Average Yield Rate The calculated weighted average effective interest rate on the securities. Number of properties Number of Real Estate Properties Commercial Mortgage Backed Securities Commercial Mortgage-Backed Securities [Member] Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Increase (decrease) in CECL reserve Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) Schedule of Common Stock Transactions Schedule of Stock by Class [Table Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Due to related party Accounts Payable Mortgage note payable, net Mortgage Note Payable Net Of Deferred Financing Costs Mortgage note payable net of deferred financing costs. Schedule of Debt Securities, Held-to-Maturity, Allowance for Credit Loss Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Stockholder servicing fees Adjustment To Additional Paid In Capital Stockholders Servicing Fees Adjustment to additional paid in capital stockholders servicing fees. 2 Risk Level, Low [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Accretion of discount (amortization of premium) Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Accretion of discount Fair value measurement with unobservable inputs reconciliation recurring basis asset accretion of discount. Austin, TX Austin, TX [Member] Austin, TX Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Number of repurchase facilities Number Of Repurchase Facilities Number Of Repurchase Facilities Investments, Debt and Equity Securities [Abstract] Included in earnings Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Consolidation of securitization trusts Consolidation Of Securitization Trusts Consolidation Of Securitization Trusts Interest Rate Cap Interest Rate Cap [Member] Entity Address, Address Line One Entity Address, Address Line One Credit facilities Line of Credit Facility, Fair Value of Amount Outstanding Income tax expense Income Tax Expense (Benefit) Collateralized Loan Obligations Collateralized Loan Obligations Collateralized Loan Obligations [Member] Annualized distribution yield Percentage Of Annualized Distribution Yield Percentage Of Annualized Distribution Yield Principles of Consolidation Consolidation, Policy [Policy Text Block] Base management fee percentage Property Management Fee, Percent Fee Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Agreement period Agreement Period Agreement Period Principal repayments of mortgage-backed securities, at fair value Principal Repayments Of Mortgage Backed Securities, At Fair Value Principal Repayments Of Mortgage Backed Securities Available For Sale. Principal collections from loans receivable, held-for-investment Proceeds from Collection of Loans Receivable Statement [Table] Statement [Table] Offering proceeds Proceeds from Issuance Initial Public Offering Net book value of loans receivable by year of origination, fiscal year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Payment of valuation service fees Payment Of Valuation Services Fee Payment Of Valuation Services Fee Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] CO-1 Facility CO-1 Facility [Member] CO-1 Facility 1 Risk Level, Very Low Risk [Member] Risk Level, Very Low Risk Weighted Average - Coupon Deb Securities, Available For Sale, Weighted Average Cash Coupon Rate Weighted average cash coupon rate.