3.26.1 html 768 535 1 true 211 0 false 12 false false R1.htm 0000001 - Document - COVER PAGE Sheet http://bsprealtytrust.com/role/COVERPAGE COVER PAGE Cover 1 false false R2.htm 9952151 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://bsprealtytrust.com/role/CONSOLIDATEDBALANCESHEETS CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://bsprealtytrust.com/role/CONSOLIDATEDBALANCESHEETSParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://bsprealtytrust.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://bsprealtytrust.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Sheet http://bsprealtytrust.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITY CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statements 6 false false R7.htm 9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://bsprealtytrust.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 9952157 - Disclosure - Organization and Business Operations Sheet http://bsprealtytrust.com/role/OrganizationandBusinessOperations Organization and Business Operations Notes 8 false false R9.htm 9952158 - Disclosure - Summary of Significant Accounting Policies Sheet http://bsprealtytrust.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 9952159 - Disclosure - Business Combinations Sheet http://bsprealtytrust.com/role/BusinessCombinations Business Combinations Notes 10 false false R11.htm 9952160 - Disclosure - Commercial Mortgage Loans, Held for Investment Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestment Commercial Mortgage Loans, Held for Investment Notes 11 false false R12.htm 9952161 - Disclosure - Commercial Mortgage Loans, Held for Sale Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforSale Commercial Mortgage Loans, Held for Sale Notes 12 false false R13.htm 9952162 - Disclosure - Mortgage Servicing Rights Sheet http://bsprealtytrust.com/role/MortgageServicingRights Mortgage Servicing Rights Notes 13 false false R14.htm 9952163 - Disclosure - Real Estate Securities Sheet http://bsprealtytrust.com/role/RealEstateSecurities Real Estate Securities Notes 14 false false R15.htm 9952164 - Disclosure - Real Estate Owned Sheet http://bsprealtytrust.com/role/RealEstateOwned Real Estate Owned Notes 15 false false R16.htm 9952165 - Disclosure - Equity Method Investments Sheet http://bsprealtytrust.com/role/EquityMethodInvestments Equity Method Investments Notes 16 false false R17.htm 9952166 - Disclosure - Leases Sheet http://bsprealtytrust.com/role/Leases Leases Notes 17 false false R18.htm 9952167 - Disclosure - Goodwill & Other Intangible Assets Sheet http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssets Goodwill & Other Intangible Assets Notes 18 false false R19.htm 9952168 - Disclosure - Debt Sheet http://bsprealtytrust.com/role/Debt Debt Notes 19 false false R20.htm 9952169 - Disclosure - Allowance for Loss Sharing Sheet http://bsprealtytrust.com/role/AllowanceforLossSharing Allowance for Loss Sharing Notes 20 false false R21.htm 9952170 - Disclosure - Earnings Per Share Sheet http://bsprealtytrust.com/role/EarningsPerShare Earnings Per Share Notes 21 false false R22.htm 9952171 - Disclosure - Redeemable Convertible Preferred Stock and Equity Transactions Sheet http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactions Redeemable Convertible Preferred Stock and Equity Transactions Notes 22 false false R23.htm 9952172 - Disclosure - Commitments and Contingencies Sheet http://bsprealtytrust.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 23 false false R24.htm 9952173 - Disclosure - Servicing Revenue Sheet http://bsprealtytrust.com/role/ServicingRevenue Servicing Revenue Notes 24 false false R25.htm 9952174 - Disclosure - Related Party Transactions and Arrangements Sheet http://bsprealtytrust.com/role/RelatedPartyTransactionsandArrangements Related Party Transactions and Arrangements Notes 25 false false R26.htm 9952175 - Disclosure - Fair Value of Financial Instruments Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstruments Fair Value of Financial Instruments Notes 26 false false R27.htm 9952176 - Disclosure - Derivative Instruments Sheet http://bsprealtytrust.com/role/DerivativeInstruments Derivative Instruments Notes 27 false false R28.htm 9952177 - Disclosure - Offsetting Assets and Liabilities Sheet http://bsprealtytrust.com/role/OffsettingAssetsandLiabilities Offsetting Assets and Liabilities Notes 28 false false R29.htm 9952178 - Disclosure - Segment Reporting Sheet http://bsprealtytrust.com/role/SegmentReporting Segment Reporting Notes 29 false false R30.htm 9952179 - Disclosure - Subsequent Events Sheet http://bsprealtytrust.com/role/SubsequentEvents Subsequent Events Notes 30 false false R31.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 31 false false R32.htm 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://bsprealtytrust.com/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://bsprealtytrust.com/role/SummaryofSignificantAccountingPolicies 32 false false R33.htm 9955512 - Disclosure - Business Combinations (Tables) Sheet http://bsprealtytrust.com/role/BusinessCombinationsTables Business Combinations (Tables) Tables http://bsprealtytrust.com/role/BusinessCombinations 33 false false R34.htm 9955513 - Disclosure - Commercial Mortgage Loans, Held for Investment (Tables) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentTables Commercial Mortgage Loans, Held for Investment (Tables) Tables http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestment 34 false false R35.htm 9955514 - Disclosure - Commercial Mortgage Loans, Held for Sale (Tables) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforSaleTables Commercial Mortgage Loans, Held for Sale (Tables) Tables http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestment 35 false false R36.htm 9955515 - Disclosure - Mortgage Servicing Rights (Tables) Sheet http://bsprealtytrust.com/role/MortgageServicingRightsTables Mortgage Servicing Rights (Tables) Tables http://bsprealtytrust.com/role/MortgageServicingRights 36 false false R37.htm 9955516 - Disclosure - Real Estate Securities (Tables) Sheet http://bsprealtytrust.com/role/RealEstateSecuritiesTables Real Estate Securities (Tables) Tables http://bsprealtytrust.com/role/RealEstateSecurities 37 false false R38.htm 9955517 - Disclosure - Real Estate Owned (Tables) Sheet http://bsprealtytrust.com/role/RealEstateOwnedTables Real Estate Owned (Tables) Tables http://bsprealtytrust.com/role/RealEstateOwned 38 false false R39.htm 9955518 - Disclosure - Equity Method Investments (Tables) Sheet http://bsprealtytrust.com/role/EquityMethodInvestmentsTables Equity Method Investments (Tables) Tables http://bsprealtytrust.com/role/EquityMethodInvestments 39 false false R40.htm 9955519 - Disclosure - Leases (Tables) Sheet http://bsprealtytrust.com/role/LeasesTables Leases (Tables) Tables http://bsprealtytrust.com/role/Leases 40 false false R41.htm 9955520 - Disclosure - Goodwill & Other Intangible Assets (Tables) Sheet http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssetsTables Goodwill & Other Intangible Assets (Tables) Tables http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssets 41 false false R42.htm 9955521 - Disclosure - Debt (Tables) Sheet http://bsprealtytrust.com/role/DebtTables Debt (Tables) Tables http://bsprealtytrust.com/role/Debt 42 false false R43.htm 9955522 - Disclosure - Allowance for Loss Sharing (Tables) Sheet http://bsprealtytrust.com/role/AllowanceforLossSharingTables Allowance for Loss Sharing (Tables) Tables http://bsprealtytrust.com/role/AllowanceforLossSharing 43 false false R44.htm 9955523 - Disclosure - Earnings Per Share (Tables) Sheet http://bsprealtytrust.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://bsprealtytrust.com/role/EarningsPerShare 44 false false R45.htm 9955524 - Disclosure - Redeemable Convertible Preferred Stock and Equity Transactions (Tables) Sheet http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactionsTables Redeemable Convertible Preferred Stock and Equity Transactions (Tables) Tables http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactions 45 false false R46.htm 9955525 - Disclosure - Commitments and Contingencies (Tables) Sheet http://bsprealtytrust.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables http://bsprealtytrust.com/role/CommitmentsandContingencies 46 false false R47.htm 9955526 - Disclosure - Servicing Revenue (Tables) Sheet http://bsprealtytrust.com/role/ServicingRevenueTables Servicing Revenue (Tables) Tables http://bsprealtytrust.com/role/ServicingRevenue 47 false false R48.htm 9955527 - Disclosure - Related Party Transactions and Arrangements (Tables) Sheet http://bsprealtytrust.com/role/RelatedPartyTransactionsandArrangementsTables Related Party Transactions and Arrangements (Tables) Tables http://bsprealtytrust.com/role/RelatedPartyTransactionsandArrangements 48 false false R49.htm 9955528 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://bsprealtytrust.com/role/FairValueofFinancialInstruments 49 false false R50.htm 9955529 - Disclosure - Derivative Instruments (Tables) Sheet http://bsprealtytrust.com/role/DerivativeInstrumentsTables Derivative Instruments (Tables) Tables http://bsprealtytrust.com/role/DerivativeInstruments 50 false false R51.htm 9955530 - Disclosure - Offsetting Assets and Liabilities (Tables) Sheet http://bsprealtytrust.com/role/OffsettingAssetsandLiabilitiesTables Offsetting Assets and Liabilities (Tables) Tables http://bsprealtytrust.com/role/OffsettingAssetsandLiabilities 51 false false R52.htm 9955531 - Disclosure - Segment Reporting (Tables) Sheet http://bsprealtytrust.com/role/SegmentReportingTables Segment Reporting (Tables) Tables http://bsprealtytrust.com/role/SegmentReporting 52 false false R53.htm 9955532 - Disclosure - Organization and Business Operations (Details) Sheet http://bsprealtytrust.com/role/OrganizationandBusinessOperationsDetails Organization and Business Operations (Details) Details http://bsprealtytrust.com/role/OrganizationandBusinessOperations 53 false false R54.htm 9955533 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://bsprealtytrust.com/role/SummaryofSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://bsprealtytrust.com/role/SummaryofSignificantAccountingPoliciesPolicies 54 false false R55.htm 9955534 - Disclosure - Business Combinations - Narrative (Details) Sheet http://bsprealtytrust.com/role/BusinessCombinationsNarrativeDetails Business Combinations - Narrative (Details) Details 55 false false R56.htm 9955535 - Disclosure - Business Combinations - Schedule of Purchase Consideration (Details) Sheet http://bsprealtytrust.com/role/BusinessCombinationsScheduleofPurchaseConsiderationDetails Business Combinations - Schedule of Purchase Consideration (Details) Details 56 false false R57.htm 9955536 - Disclosure - Business Combinations - Schedule of Revenue and Earnings (Details) Sheet http://bsprealtytrust.com/role/BusinessCombinationsScheduleofRevenueandEarningsDetails Business Combinations - Schedule of Revenue and Earnings (Details) Details 57 false false R58.htm 9955537 - Disclosure - Business Combinations - Schedule of Proforma Financial Information (Details) Sheet http://bsprealtytrust.com/role/BusinessCombinationsScheduleofProformaFinancialInformationDetails Business Combinations - Schedule of Proforma Financial Information (Details) Details 58 false false R59.htm 9955538 - Disclosure - Commercial Mortgage Loans, Held for Investment - Schedule of Loans Receivable by Class (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofLoansReceivablebyClassDetails Commercial Mortgage Loans, Held for Investment - Schedule of Loans Receivable by Class (Details) Details 59 false false R60.htm 9955539 - Disclosure - Commercial Mortgage Loans, Held for Investment - Schedule of Commercial Mortgage Loan Portfolio, Held-For-Investment (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofCommercialMortgageLoanPortfolioHeldForInvestmentDetails Commercial Mortgage Loans, Held for Investment - Schedule of Commercial Mortgage Loan Portfolio, Held-For-Investment (Details) Details 60 false false R61.htm 9955540 - Disclosure - Commercial Mortgage Loans, Held for Investment - Narrative (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentNarrativeDetails Commercial Mortgage Loans, Held for Investment - Narrative (Details) Details 61 false false R62.htm 9955541 - Disclosure - Commercial Mortgage Loans, Held for Investment - Schedule of Commercial Mortgage Loans, Held for Investment Portfolio (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofCommercialMortgageLoansHeldforInvestmentPortfolioDetails Commercial Mortgage Loans, Held for Investment - Schedule of Commercial Mortgage Loans, Held for Investment Portfolio (Details) Details 62 false false R63.htm 9955542 - Disclosure - Commercial Mortgage Loans, Held for Investment - Schedule of Allowance for Credit Losses (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofAllowanceforCreditLossesDetails Commercial Mortgage Loans, Held for Investment - Schedule of Allowance for Credit Losses (Details) Details 63 false false R64.htm 9955543 - Disclosure - Commercial Mortgage Loans, Held for Investment - Schedule of Past Due (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofPastDueDetails Commercial Mortgage Loans, Held for Investment - Schedule of Past Due (Details) Details 64 false false R65.htm 9955544 - Disclosure - Commercial Mortgage Loans, Held for Investment- Schedule of Non-Performing Status (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofNonPerformingStatusDetails Commercial Mortgage Loans, Held for Investment- Schedule of Non-Performing Status (Details) Details 65 false false R66.htm 9955545 - Disclosure - Commercial Mortgage Loans, Held for Investment - Schedule of Allocation by Risk Rating (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforInvestmentScheduleofAllocationbyRiskRatingDetails Commercial Mortgage Loans, Held for Investment - Schedule of Allocation by Risk Rating (Details) Details 66 false false R67.htm 9955546 - Disclosure - Commercial Mortgage Loans, Held for Sale - Narrative (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforSaleNarrativeDetails Commercial Mortgage Loans, Held for Sale - Narrative (Details) Details 67 false false R68.htm 9955547 - Disclosure - Commercial Mortgage Loans, Held for Sale - Schedule of Aggregate Unpaid Principal Balance and Fair Value of Our Mortgage Loans, Held for Sale (Details) Sheet http://bsprealtytrust.com/role/CommercialMortgageLoansHeldforSaleScheduleofAggregateUnpaidPrincipalBalanceandFairValueofOurMortgageLoansHeldforSaleDetails Commercial Mortgage Loans, Held for Sale - Schedule of Aggregate Unpaid Principal Balance and Fair Value of Our Mortgage Loans, Held for Sale (Details) Details 68 false false R69.htm 9955548 - Disclosure - Mortgage Servicing Rights - Narrative (Details) Sheet http://bsprealtytrust.com/role/MortgageServicingRightsNarrativeDetails Mortgage Servicing Rights - Narrative (Details) Details 69 false false R70.htm 9955549 - Disclosure - Mortgage Servicing Rights - Schedule of Activity Related to MSRs (Detail) Sheet http://bsprealtytrust.com/role/MortgageServicingRightsScheduleofActivityRelatedtoMSRsDetail Mortgage Servicing Rights - Schedule of Activity Related to MSRs (Detail) Details 70 false false R71.htm 9955550 - Disclosure - Mortgage Servicing Rights - Schedule of Expected Amortization of MSRs (Details) Sheet http://bsprealtytrust.com/role/MortgageServicingRightsScheduleofExpectedAmortizationofMSRsDetails Mortgage Servicing Rights - Schedule of Expected Amortization of MSRs (Details) Details 71 false false R72.htm 9955551 - Disclosure - Real Estate Securities - Schedule of Securities Classified As Available For Sale (Details) Sheet http://bsprealtytrust.com/role/RealEstateSecuritiesScheduleofSecuritiesClassifiedAsAvailableForSaleDetails Real Estate Securities - Schedule of Securities Classified As Available For Sale (Details) Details 72 false false R73.htm 9955552 - Disclosure - Real Estate Securities - Schedule of Amortized Cost and Fair Value of CLO Bonds (Details) Sheet http://bsprealtytrust.com/role/RealEstateSecuritiesScheduleofAmortizedCostandFairValueofCLOBondsDetails Real Estate Securities - Schedule of Amortized Cost and Fair Value of CLO Bonds (Details) Details 73 false false R74.htm 9955553 - Disclosure - Real Estate Securities - Narrative (Details) Sheet http://bsprealtytrust.com/role/RealEstateSecuritiesNarrativeDetails Real Estate Securities - Narrative (Details) Details 74 false false R75.htm 9955554 - Disclosure - Real Estate Owned - Schedule of Real Estate Owned, Held For Investment (Details) Sheet http://bsprealtytrust.com/role/RealEstateOwnedScheduleofRealEstateOwnedHeldForInvestmentDetails Real Estate Owned - Schedule of Real Estate Owned, Held For Investment (Details) Details 75 false false R76.htm 9955555 - Disclosure - Real Estate Owned - Narrative (Details) Sheet http://bsprealtytrust.com/role/RealEstateOwnedNarrativeDetails Real Estate Owned - Narrative (Details) Details 76 false false R77.htm 9955556 - Disclosure - Real Estate Owned - Schedule of Real Estate Owned, Held For Sale (Details) Sheet http://bsprealtytrust.com/role/RealEstateOwnedScheduleofRealEstateOwnedHeldForSaleDetails Real Estate Owned - Schedule of Real Estate Owned, Held For Sale (Details) Details 77 false false R78.htm 9955557 - Disclosure - Equity Method Investments - Narrative (Details) Sheet http://bsprealtytrust.com/role/EquityMethodInvestmentsNarrativeDetails Equity Method Investments - Narrative (Details) Details 78 false false R79.htm 9955558 - Disclosure - Equity Method Investments - Schedule of Combined Financial Position (Details) Sheet http://bsprealtytrust.com/role/EquityMethodInvestmentsScheduleofCombinedFinancialPositionDetails Equity Method Investments - Schedule of Combined Financial Position (Details) Details 79 false false R80.htm 9955559 - Disclosure - Equity Method Investments - Schedule of Combined Results of Operations (Details) Sheet http://bsprealtytrust.com/role/EquityMethodInvestmentsScheduleofCombinedResultsofOperationsDetails Equity Method Investments - Schedule of Combined Results of Operations (Details) Details 80 false false R81.htm 9955560 - Disclosure - Leases - Narrative (Details) Sheet http://bsprealtytrust.com/role/LeasesNarrativeDetails Leases - Narrative (Details) Details 81 false false R82.htm 9955561 - Disclosure - Leases - Schedule of Lease (Details) Sheet http://bsprealtytrust.com/role/LeasesScheduleofLeaseDetails Leases - Schedule of Lease (Details) Details 82 false false R83.htm 9955562 - Disclosure - Leases - Schedule of Operating Lease Right of Use Assets (Details) Sheet http://bsprealtytrust.com/role/LeasesScheduleofOperatingLeaseRightofUseAssetsDetails Leases - Schedule of Operating Lease Right of Use Assets (Details) Details 83 false false R84.htm 9955563 - Disclosure - Leases - Schedule of Future Minimum Payments to be Received (Details) Sheet http://bsprealtytrust.com/role/LeasesScheduleofFutureMinimumPaymentstobeReceivedDetails Leases - Schedule of Future Minimum Payments to be Received (Details) Details 84 false false R85.htm 9955564 - Disclosure - Goodwill & Other Intangible Assets - Schedule of Carrying Amount of Goodwill by Reporting Segment (Details) Sheet http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssetsScheduleofCarryingAmountofGoodwillbyReportingSegmentDetails Goodwill & Other Intangible Assets - Schedule of Carrying Amount of Goodwill by Reporting Segment (Details) Details 85 false false R86.htm 9955565 - Disclosure - Goodwill & Other Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) Sheet http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssetsScheduleofIntangibleAssetsandGoodwillDetails Goodwill & Other Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) Details 86 false false R87.htm 9955566 - Disclosure - Goodwill & Other Intangible Assets - Narrative (Details) Sheet http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssetsNarrativeDetails Goodwill & Other Intangible Assets - Narrative (Details) Details 87 false false R88.htm 9955567 - Disclosure - Goodwill & Other Intangible Assets - Schedule of Identified Intangible Assets, Net Amortization (Details) Sheet http://bsprealtytrust.com/role/GoodwillOtherIntangibleAssetsScheduleofIdentifiedIntangibleAssetsNetAmortizationDetails Goodwill & Other Intangible Assets - Schedule of Identified Intangible Assets, Net Amortization (Details) Details 88 false false R89.htm 9955568 - Disclosure - Debt - Schedule of Debt (Details) Sheet http://bsprealtytrust.com/role/DebtScheduleofDebtDetails Debt - Schedule of Debt (Details) Details 89 false false R90.htm 9955569 - Disclosure - Debt - Narrative (Details) Sheet http://bsprealtytrust.com/role/DebtNarrativeDetails Debt - Narrative (Details) Details 90 false false R91.htm 9955570 - Disclosure - Debt - Schedule of Repurchase Agreements (Details) Sheet http://bsprealtytrust.com/role/DebtScheduleofRepurchaseAgreementsDetails Debt - Schedule of Repurchase Agreements (Details) Details 91 false false R92.htm 9955571 - Disclosure - Debt - Schedule of Collateralized Loan Obligations by Tranche (Details) Sheet http://bsprealtytrust.com/role/DebtScheduleofCollateralizedLoanObligationsbyTrancheDetails Debt - Schedule of Collateralized Loan Obligations by Tranche (Details) Details 92 false false R93.htm 9955572 - Disclosure - Debt - Schedule of Collateralized Loan Obligations (Details) Sheet http://bsprealtytrust.com/role/DebtScheduleofCollateralizedLoanObligationsDetails Debt - Schedule of Collateralized Loan Obligations (Details) Details 93 false false R94.htm 9955573 - Disclosure - Allowance for Loss Sharing - Narrative (Details) Sheet http://bsprealtytrust.com/role/AllowanceforLossSharingNarrativeDetails Allowance for Loss Sharing - Narrative (Details) Details 94 false false R95.htm 9955574 - Disclosure - Allowance for Loss Sharing - Schedule of Allowance for Loss Sharing (Details) Sheet http://bsprealtytrust.com/role/AllowanceforLossSharingScheduleofAllowanceforLossSharingDetails Allowance for Loss Sharing - Schedule of Allowance for Loss Sharing (Details) Details 95 false false R96.htm 9955575 - Disclosure - Earnings Per Share (Details) Sheet http://bsprealtytrust.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://bsprealtytrust.com/role/EarningsPerShareTables 96 false false R97.htm 9955576 - Disclosure - Redeemable Convertible Preferred Stock and Equity Transactions - Schedule of Shares Outstanding (Details) Sheet http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactionsScheduleofSharesOutstandingDetails Redeemable Convertible Preferred Stock and Equity Transactions - Schedule of Shares Outstanding (Details) Details 97 false false R98.htm 9955577 - Disclosure - Redeemable Convertible Preferred Stock and Equity Transactions - Narrative (Details) Sheet http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactionsNarrativeDetails Redeemable Convertible Preferred Stock and Equity Transactions - Narrative (Details) Details http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactionsTables 98 false false R99.htm 9955578 - Disclosure - Redeemable Convertible Preferred Stock and Equity Transactions - Schedule of Repurchases (Details) Sheet http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactionsScheduleofRepurchasesDetails Redeemable Convertible Preferred Stock and Equity Transactions - Schedule of Repurchases (Details) Details 99 false false R100.htm 9955579 - Disclosure - Redeemable Convertible Preferred Stock and Equity Transactions - Schedule of Changes in Accumulated Other Comprehensive Income/(Loss) (Details) Sheet http://bsprealtytrust.com/role/RedeemableConvertiblePreferredStockandEquityTransactionsScheduleofChangesinAccumulatedOtherComprehensiveIncomeLossDetails Redeemable Convertible Preferred Stock and Equity Transactions - Schedule of Changes in Accumulated Other Comprehensive Income/(Loss) (Details) Details 100 false false R101.htm 9955580 - Disclosure - Commitments and Contingencies - Schedule of Unfunded Commitments Under Commercial Mortgage Loans (Details) Sheet http://bsprealtytrust.com/role/CommitmentsandContingenciesScheduleofUnfundedCommitmentsUnderCommercialMortgageLoansDetails Commitments and Contingencies - Schedule of Unfunded Commitments Under Commercial Mortgage Loans (Details) Details 101 false false R102.htm 9955581 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://bsprealtytrust.com/role/CommitmentsandContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) Details 102 false false R103.htm 9955582 - Disclosure - Servicing Revenue - Schedule of Components of Servicing Revenue (Details) Sheet http://bsprealtytrust.com/role/ServicingRevenueScheduleofComponentsofServicingRevenueDetails Servicing Revenue - Schedule of Components of Servicing Revenue (Details) Details 103 false false R104.htm 9955583 - Disclosure - Servicing Revenue - Narrative (Details) Sheet http://bsprealtytrust.com/role/ServicingRevenueNarrativeDetails Servicing Revenue - Narrative (Details) Details 104 false false R105.htm 9955584 - Disclosure - Servicing Revenue - Schedule of Product (Details) Sheet http://bsprealtytrust.com/role/ServicingRevenueScheduleofProductDetails Servicing Revenue - Schedule of Product (Details) Details 105 false false R106.htm 9955585 - Disclosure - Servicing Revenue - Schedule Geographic Concentration (Details) Sheet http://bsprealtytrust.com/role/ServicingRevenueScheduleGeographicConcentrationDetails Servicing Revenue - Schedule Geographic Concentration (Details) Details 106 false false R107.htm 9955586 - Disclosure - Related Party Transactions and Arrangements - Narrative (Details) Sheet http://bsprealtytrust.com/role/RelatedPartyTransactionsandArrangementsNarrativeDetails Related Party Transactions and Arrangements - Narrative (Details) Details 107 false false R108.htm 9955587 - Disclosure - Related Party Transactions and Arrangements - Schedule of Costs Incurred From Arrangements with Advisor and Affiliates (Details) Sheet http://bsprealtytrust.com/role/RelatedPartyTransactionsandArrangementsScheduleofCostsIncurredFromArrangementswithAdvisorandAffiliatesDetails Related Party Transactions and Arrangements - Schedule of Costs Incurred From Arrangements with Advisor and Affiliates (Details) Details 108 false false R109.htm 9955588 - Disclosure - Fair Value of Financial Instruments - Schedule of Financial Instruments Carried at Fair Value on a Recurring Basis (Details) Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstrumentsScheduleofFinancialInstrumentsCarriedatFairValueonaRecurringBasisDetails Fair Value of Financial Instruments - Schedule of Financial Instruments Carried at Fair Value on a Recurring Basis (Details) Details 109 false false R110.htm 9955589 - Disclosure - Fair Value of Financial Instruments - Schedule of Valuation Method of Level 3 Financial Instruments Measured on a Recurring Basis (Details) Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstrumentsScheduleofValuationMethodofLevel3FinancialInstrumentsMeasuredonaRecurringBasisDetails Fair Value of Financial Instruments - Schedule of Valuation Method of Level 3 Financial Instruments Measured on a Recurring Basis (Details) Details 110 false false R111.htm 9955590 - Disclosure - Fair Value of Financial Instruments - Schedule of Changes in the Company's Financial Instruments Classified as Level III (Details) Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstrumentsScheduleofChangesintheCompanysFinancialInstrumentsClassifiedasLevelIIIDetails Fair Value of Financial Instruments - Schedule of Changes in the Company's Financial Instruments Classified as Level III (Details) Details 111 false false R112.htm 9955591 - Disclosure - Fair Value of Financial Instruments - Narrative (Details) Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstrumentsNarrativeDetails Fair Value of Financial Instruments - Narrative (Details) Details 112 false false R113.htm 9955592 - Disclosure - Fair Value of Financial Instruments - Schedule of Financial Instruments Not Measured at Fair Value (Details) Sheet http://bsprealtytrust.com/role/FairValueofFinancialInstrumentsScheduleofFinancialInstrumentsNotMeasuredatFairValueDetails Fair Value of Financial Instruments - Schedule of Financial Instruments Not Measured at Fair Value (Details) Details 113 false false R114.htm 9955593 - Disclosure - Derivative Instruments - Schedule of Outstanding Derivatives (Details) Sheet http://bsprealtytrust.com/role/DerivativeInstrumentsScheduleofOutstandingDerivativesDetails Derivative Instruments - Schedule of Outstanding Derivatives (Details) Details 114 false false R115.htm 9955594 - Disclosure - Derivative Instruments - Schedule of Derivative Instruments, Gain (Loss) (Details) Sheet http://bsprealtytrust.com/role/DerivativeInstrumentsScheduleofDerivativeInstrumentsGainLossDetails Derivative Instruments - Schedule of Derivative Instruments, Gain (Loss) (Details) Details 115 false false R116.htm 9955595 - Disclosure - Offsetting Assets and Liabilities (Details) Sheet http://bsprealtytrust.com/role/OffsettingAssetsandLiabilitiesDetails Offsetting Assets and Liabilities (Details) Details http://bsprealtytrust.com/role/OffsettingAssetsandLiabilitiesTables 116 false false R117.htm 9955596 - Disclosure - Segment Reporting (Details) Sheet http://bsprealtytrust.com/role/SegmentReportingDetails Segment Reporting (Details) Details http://bsprealtytrust.com/role/SegmentReportingTables 117 false false R118.htm 9955597 - Disclosure - Subsequent Events (Details) Sheet http://bsprealtytrust.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://bsprealtytrust.com/role/SubsequentEvents 118 false false All Reports Book All Reports bsprt-20260331.htm bsprt-20260331.xsd bsprt-20260331_cal.xml bsprt-20260331_def.xml bsprt-20260331_lab.xml bsprt-20260331_pre.xml bsprt-20260331_g1.jpg bsprt-20260331_g10.jpg bsprt-20260331_g11.jpg bsprt-20260331_g2.jpg bsprt-20260331_g3.jpg bsprt-20260331_g4.jpg bsprt-20260331_g5.jpg bsprt-20260331_g6.jpg bsprt-20260331_g7.jpg bsprt-20260331_g8.jpg bsprt-20260331_g9.jpg http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true