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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Outstanding loan commitments	$ 496,200	$ 475,100
Future commitments outstanding related to investments	7,700
SBIC [Member]
Other Commitments [Line Items]
Future commitments outstanding related to investments	9,000
Other Liabilities [Member]
Other Commitments [Line Items]
Reserves for unfunded commitments to borrowers	1,000	962
Performance Stand-by Letters of Credit [Member]
Other Commitments [Line Items]
Outstanding stand-by letters of credit	77	655
Financial Stand-by Letters of Credit [Member]
Other Commitments [Line Items]
Outstanding stand-by letters of credit	$ 4,700	$ 4,500