Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Outstanding loan commitments	$ 386,600	$ 386,600	$ 480,800
Cancellable amounts	107,700	107,700	113,500
Outstanding stand-by letters of credit	13,100	13,100	12,600
Credit losses for unfunded commitments	500	1,500
Future commitments outstanding related to investments	8,100	8,100
Other Liabilities [Member]
Other Commitments [Line Items]
Reserves for unfunded commitments to borrowers	$ 1,600	$ 1,600	$ 3,100