Commitments and Contingencies - Additional Information (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Long Term Purchase Commitment [Line Items]
Unfunded commitments related to loans held for investment	$ 463,000,000.0	$ 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	$ 4,800,000	$ 4,200,000