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Loans Held for Investment at Amortized Cost and Loans Held for Investment at Fair Value - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 75 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]              
Accrued interest income recognized on nonaccrual loans     $ 0 $ 0      
Cash basis interest income recognized on nonaccrual loans $ 12,200,000 $ 14,000,000 21,900,000 22,500,000      
Average recorded investment of individually evaluated loans, computed using month-end balances 212,900,000 $ 289,100,000 228,000,000 $ 294,900,000      
COVID-19              
Accounts Notes And Loans Receivable [Line Items]              
Loans 117,700,000   117,700,000   $ 117,700,000 $ 127,300,000  
COVID 19 Forbearance Program              
Accounts Notes And Loans Receivable [Line Items]              
Amount of loan granted for unusual risk forbearance $ 294,300,000   294,300,000   294,300,000   $ 415,900,000
Accrued interest income recognized on nonaccrual loans     $ 7,000,000   $ 17,700,000    
Loans held for investment unpaid principal balance performing and accruing, percentage 77.50%   77.50%   77.50% 76.60%  
Loans held for investment unpaid principal balance nonperforming and nonaccrual percentage 22.50%   22.50%   22.50% 23.40%