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Commitments and Contingencies - Additional Information (Detail) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Long Term Purchase Commitment [Line Items]    
Unfunded commitments related to loans held for investment $ 470,900,000 $ 487,800,000
COVID-19    
Long Term Purchase Commitment [Line Items]    
Contingencies 0  
Accrued Expenses and Other Liabilities    
Long Term Purchase Commitment [Line Items]    
Allowance for credit losses on loan commitments $ 9,200,000 $ 4,200,000