Commitments and Contingencies - Additional Information (Detail) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Long Term Purchase Commitment [Line Items]
Unfunded commitments related to loans held for investment	$ 300,500,000	$ 426,100,000
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	$ 28,000,000	$ 17,300,000