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Loans Held for Investment and Loans Held for Investment at Fair Value - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 42 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]              
Accrued interest income recognized on nonaccrual loans     $ 0        
Cash basis interest income recognized on nonaccrual loans $ 7,900,000 $ 8,000,000 22,100,000 $ 24,000,000      
Average recorded investment of individually evaluated loans, computed using month-end balances 355,300,000 $ 252,300,000 329,700,000 $ 265,000,000      
COVID-19              
Accounts Notes And Loans Receivable [Line Items]              
Loans 179,000,000   $ 179,000,000   $ 179,000,000 $ 203,300,000  
90+days              
Accounts Notes And Loans Receivable [Line Items]              
Annualized charge rate of non performing loans     0.53% 0.27%      
COVID 19 Forbearance Program              
Accounts Notes And Loans Receivable [Line Items]              
Amount of loan granted for unusual risk forbearance $ 239,500,000   $ 239,500,000   239,500,000   $ 410,800,000
Accrued interest income recognized on nonaccrual loans     $ 4,800,000   $ 12,600,000    
Loans held for investment unpaid principal balance performing and accruing, percentage 76.70%   76.70%   76.70% 80.30%  
Loans held for investment unpaid principal balance nonperforming and nonaccrual percentage 23.30%   23.30%   23.30% 19.70%