Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Allowance for credit losses	$ 8,554	$ 7,711
Unrealized loss on securities available for sale	13,104	11,633
Unrealized loss on minimum pension liability	1,198	1,198
Deferred compensation	1,241	1,155
Unfunded commitment liability	733	819
Deferred loan fees	583	576
Purchase accounting adjustments	524	135
Accrued compensation	674	368
Lease liability	231	343
Other	74	287
Deferred tax asset	26,916	24,225
Deferred tax liabilities
Fixed assets depreciation	(1,968)	(2,198)
Prepaid pension	(1,602)	(1,343)
Loan servicing rights	(624)	(634)
Discount accretion on securities	(244)	(502)
FHLB stock dividends	(126)	(223)
Right of use asset	(231)	(343)
Prepaids	(297)	(314)
Other	(143)	(311)
Deferred tax liability	(5,235)	(5,868)
Net deferred tax asset	$ 21,681	$ 18,357