Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowance for loan losses	$ 988,000	$ 918,000
Deferred compensation liabilities	468,000	452,000
Contribution carryforward	120,000	170,000
State tax credit carryforward	52,000	142,000
Interest rate swaps		37,000
Other	56,000	57,000
Subtotal	1,684,000	1,776,000
Less: valuation allowance	(60,000)	(85,000)
Total deferred tax assets	1,624,000	1,691,000
Deferred tax liabilities:
Depreciation	(45,000)	(111,000)
Interest rate swaps	(54,000)
Securities available-for-sale	(213,000)	(550,000)
Prepaid expenses	(43,000)	(59,000)
Net deferred loan costs	(447,000)	(191,000)
Mortgage servicing rights	(87,000)	(74,000)
Total deferred tax liabilities	(889,000)	(985,000)
Net deferred tax assets, included in other assets	$ 735,000	$ 706,000