Income Taxes - Summary of the Sources of Differences Between Income Taxes At the Federal Statutory Rate and the Provision (Credit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income taxes at statutory rate, Amount	$ (1,345)	$ (67)
Increase in cash value of life insurance, Amount	(124)	(89)
Change in valuation allowance, Amount	1,756
Other net, Amount	101	(15)
Total income tax expense (benefit), Amount	$ 388	$ (171)
Reconciliation of statutory to effective rates: Percentage
Federal income taxes at statutory rate, Percentage	21.00%	21.00%
Increase in cash value of life insurance, Percentage	1.94%	27.90%
Change in valuation allowance, Percentage	(27.42%)
Other net, Percentage	(1.58%)	4.70%
Total income tax expense (benefit), Percentage	(6.06%)	53.60%