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Commercial Mortgage Loans Held for Investment - Schedule of Commercial Mortgage Loans held for Investment Portfolio (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
 [4]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Balance at Beginning of Year $ 563,071  
Balance at Beginning of Year, Allowance for credit losses [1] (13,898)  
Balance at Beginning of Year, Carrying value [1] 549,173  
Loan originations/advances 2,043  
Principal repayments (72,967)  
Sale of loan [2] (47,476)  
Amortization of loan origination and deferred exit fees 849  
Deferred interest capitalized on real estate loan 631  
Origination fees and extension fees received on commercial loans (776)  
Transfer on foreclosure to real estate owned [3] (61,826)  
Reversal for credit losses, Allowance for credit losses 3,357  
Reversal of credit losses, carrying value 3,357  
Charge-offs, Allowance for credit losses 2,379 [3] $ 855
Charge-offs, Carrying Value [3] 2,379  
Balance at End of Period 383,549  
Balance at End of Period, Allowance for credit losses [1] (8,162)  
Balance at End of Period, Carrying value [1] 375,387  
Commercial Mortgage Loans at Cost    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Balance at Beginning of Year 563,071  
Loan originations/advances 2,043  
Principal repayments (72,967)  
Sale of loan [2] (47,476)  
Amortization of loan origination and deferred exit fees 849  
Deferred interest capitalized on real estate loan 631  
Origination fees and extension fees received on commercial loans (776)  
Transfer on foreclosure to real estate owned [3] (61,826)  
Balance at End of Period $ 383,549  
[1] First mortgage loans are first position mortgage loans and credit loans are mezzanine and subordinated loans.
[2] Relates to the sale of a loan that was placed on nonaccrual status as of July 15, 2025. The Company completed the sale of the loan in September 2025 and recognized a loss on sale of $8,413 on the loan, which is included within net realized (loss) gain on disposition of commercial loans in the accompanying consolidated statements of operations.
[3] Relates to the acquisition of two properties secured by senior loans. See Note 13 – “Real Estate Owned” for additional information.
[4] Relates to the acquisition of two properties secured by a senior loan in July 2024. See Note 13 - “Real Estate Owned” for additional information.