Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Other Comprehensive Income Loss [Abstract]
Gains on sale of securities available-for-sale	$ (535)	$ (410)
Tax effect	145	111
Net income (loss)	(390)	(299)
Net amortization of bond premiums	699	400
Tax effect	(189)	(108)
Net income (loss)	510	292
Net interest expense on swaps	48	3
Tax effect	(13)	(1)
Net income (loss)	35	2
Total reclassification adjustments	$ 155	$ (5)