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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Outstanding loan commitments	$ 654,200	$ 475,100
Future commitments outstanding related to investments	10,800
SBIC [Member]
Other Commitments [Line Items]
Future commitments outstanding related to investments	10,700
Other Liabilities [Member]
Other Commitments [Line Items]
Reserves for unfunded commitments to borrowers	1,400	962
Performance Stand-by Letters of Credit [Member]
Other Commitments [Line Items]
Outstanding stand-by letters of credit	0	655
Financial Stand-by Letters of Credit [Member]
Other Commitments [Line Items]
Outstanding stand-by letters of credit	$ 29,800	$ 4,500