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Loans Held for Investment and Loans Held for Investment at Fair Value - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]          
Accrued interest income recognized on nonaccrual loans $ 0 $ 0 $ 0 $ 0  
Cash basis interest income recognized on nonaccrual loans 9,900,000 3,400,000 16,700,000 6,700,000  
Average recorded investment of individually evaluated loans, computed using month-end balances 337,900,000 217,800,000 $ 337,500,000 180,200,000  
Stress Scenario , Descriptions     For the June 30, 2021 estimate, the Company considered a COVID-19 adverse stress scenario with a five-quarter reasonable and supportable forecast period followed by a four-quarter straight-line reversion period. Management concluded that applying the adverse stress scenario was appropriate given the status of the pandemic at the end of June 2021    
Provision for loan losses (1,000,000) 1,800,000 $ (895,000) 3,088,000  
COVID-19          
Accounts Notes And Loans Receivable [Line Items]          
Loans 346,700,000   $ 346,700,000   $ 396,900,000
90+days          
Accounts Notes And Loans Receivable [Line Items]          
Annualized charge rate of non performing loans     0.59%   0.65%
Allowance For Credit Losses          
Accounts Notes And Loans Receivable [Line Items]          
Provision for loan losses $ (1,000,000.0) 1,800,000 $ (900,000) 3,100,000  
COVID 19 Forbearance Program          
Accounts Notes And Loans Receivable [Line Items]          
Percentage of loan granted for unusual risk forbearance 73.60%   73.60%   83.60%
Amount of loan granted for unusual risk forbearance $ 90,200,000 $ 404,100,000 $ 90,200,000 404,100,000  
Accrued interest income recognized on nonaccrual loans     $ 1,300,000 $ 8,600,000  
Nonaccrual loans Percentage 26.40%   26.40%   16.40%