Income Taxes - Tax Effects of Temporary Differences of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract]
Allowance for loan losses	$ 1,534	$ 1,698
Unrealized loss on securities	3,434	565
Other	35	50
Deferred tax assets	5,003	2,313
Premises and equipment	(598)	(683)
Federal Home Loan Bank stock dividends	(268)	(376)
Deferred loan fees	(288)	(267)
Prepaid expenses	(188)	(157)
Other	(602)	(505)
Deferred tax liabilities	(1,944)	(1,988)
Net deferred tax asset (liability)	$ 3,059	$ 325