Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Interest Income	$ 7,129	$ 7,805	$ 7,014	$ 7,581	$ 7,804	$ 7,714	$ 7,731	$ 7,817	$ 8,110	$ 8,262	$ 8,121	$ 7,968	$ 29,529	$ 31,066	$ 32,461
Net Interest Income	6,713	7,325	6,471	7,008	7,184	7,041	7,012	6,916	7,129	7,188	7,071	7,011	27,517	28,153	28,399
Net income	$ 2,306	$ 2,901	$ 2,745	$ 2,885	$ 2,679	$ 2,800	$ 2,606	$ 2,483	$ 2,593	$ 2,695	$ 2,586	$ 2,540	$ 10,837	$ 10,568	$ 10,414
Basic Earnings Per Share	$ 0.85	$ 1.06	$ 1.00	$ 1.05	$ 0.97	$ 1.02	$ 0.95	$ 0.91	$ 0.95	$ 0.98	$ 0.94	$ 0.93
Diluted Earnings Per Share	$ 0.85	$ 1.06	$ 1.00	$ 1.05	$ 0.97	$ 1.02	$ 0.95	$ 0.91	$ 0.95	$ 0.98	$ 0.94	$ 0.93