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Loans Held for Investment at Amortized Cost and Loans Held for Investment at Fair Value - Summary of Loans Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]            
Allowance for loan losses $ (4,586) $ (4,882) $ (4,174) $ (4,851) $ (5,240) $ (4,769)
Loans At Amortized Cost Held For Investment            
Accounts Notes And Loans Receivable [Line Items]            
Unpaid principal balance 2,111,569   2,400,720      
Deferred loan origination costs 20,187   23,570      
Total, gross 2,131,756   2,424,290      
Allowance for loan losses (4,586)   (4,174)      
Total loans held for investment 2,127,170   2,420,116      
Loans At Fair Value Held For Investment            
Accounts Notes And Loans Receivable [Line Items]            
Unpaid principal balance 4,161,729   2,655,217      
Valuation adjustments on FVO loans 209,588   111,734      
Total, gross 4,371,317   2,766,951      
Total loans held for investment 4,371,317   2,766,951      
Total Loans Held For Investment            
Accounts Notes And Loans Receivable [Line Items]            
Unpaid principal balance 6,273,298   5,055,937      
Valuation adjustments on FVO loans 209,588   111,734      
Deferred loan origination costs 20,187   23,570      
Total, gross 6,503,073   5,191,241      
Allowance for loan losses (4,586)   (4,174)      
Total loans held for investment $ 6,498,487   $ 5,187,067