Income Taxes - Schedule of Reasons for Differences in Amount Computed by U.S. Federal Income Tax Rates (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Computed "expected" tax (benefit) expense	$ (213)	$ 677
State tax (benefit) expense, net of federal tax benefit	(18)	118
BOLI income	(21)	(22)
Valuation allowance	62
Income on tax exempt securities	(252)	(178)
Other	(8)	6
Income tax expense (benefit)	$ (451)	$ 601
Computed "expected" tax (benefit)	(21.00%)
Computed “expected” tax expense		21.00%
State tax, net of federal tax benefit	(1.80%)	3.70%
BOLI income	(2.10%)	(0.70%)
Valuation allowance	6.10%
Income on tax exempt securities	(24.80%)	(5.50%)
Other	(0.80%)	0.20%
Effective income tax rate	(44.40%)	18.70%