Quarterly Financial Information (Unaudited) - Summary of Unaudited Condensed Consolidated Result of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Selected Quarterly Financial Information [Abstract]
Interest income	$ 15,543	$ 15,539	$ 15,179	$ 15,032	$ 14,747	$ 13,188	$ 12,781	$ 12,303	$ 61,293	$ 53,019
Interest expense	1,576	1,698	1,593	1,696	1,985	2,000	1,996	2,121	6,563	8,102
Net interest income	13,967	13,841	13,586	13,336	12,762	11,188	10,785	10,182	54,730	44,917
Provision for loan losses	504	300	(1,100)	300	700	850	2,930	400	4	4,880
Net interest income after provision for loan losses	13,463	13,541	14,686	13,036	12,062	10,338	7,855	9,782	54,726	40,037
Non-interest income	994	1,302	956	921	917	1,028	777	1,290	4,173	4,012
Non-interest expense	10,009	10,513	9,835	10,080	10,417	10,545	6,440	10,407	40,437	37,809
Income (loss) before provision for income taxes	4,448	4,330	5,807	3,877	2,562	821	2,192	665	18,462	6,240
Provision for income taxes	1,267	1,114	1,645	1,068	777	326	642	192	5,094	1,937
Net income	$ 3,181	$ 3,216	$ 4,162	$ 2,809	$ 1,785	$ 495	$ 1,550	$ 473	$ 13,368	$ 4,303
Basic earnings per common share	$ 0.39	$ 0.39	$ 0.51	$ 0.34	$ 0.22	$ 0.06	$ 0.19	$ 0.06	$ 1.63	$ 0.53
Diluted earnings per common share	$ 0.38	$ 0.39	$ 0.50	$ 0.34	$ 0.22	$ 0.06	$ 0.19	$ 0.06	$ 1.61	$ 0.53