Commitments and Contingencies - Summary of Balance and Activity in Allowance for Credit Losses for Unfunded Loan Commitments (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Loss Contingencies [Line Items]
Balance, beginning of period	$ 5,908,000	$ 4,713,000	$ 5,561,000	$ 2,290,000
Recovery of credit losses	(93,000)	(18,000)	(171,000)	(86,000)
Balance, end of period	5,736,000	$ 5,115,000	5,736,000	$ 5,115,000
Unfunded Commitments [Member]
Loss Contingencies [Line Items]
Balance, beginning of period			184,000
Recovery of credit losses			(21,000)
Balance, end of period	$ 163,000		$ 163,000