Quarterly Financial Data (Unaudited) - Summarized Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 13,375	$ 13,016	$ 12,920	$ 14,345	$ 14,703	$ 15,112	$ 14,878	$ 14,086	$ 53,656	$ 58,779	$ 50,068
Interest expense	1,194	1,597	2,272	3,229	3,625	3,893	3,701	3,288	8,292	14,507	9,111
Net interest income	12,181	11,419	10,648	11,116	11,078	11,219	11,177	10,798	45,364	44,272	40,957
Provision for loan losses	1,831	1,399	1,988	743	411	290	401		5,961	1,102	1,267
Net interest income after provision for loan losses	10,350	10,020	8,660	10,373	10,667	10,929	10,776	10,798	39,403	43,170	39,690
Noninterest income	3,392	3,021	2,062	2,296	2,513	2,733	2,647	3,533	10,771	11,426	9,329
Noninterest expense	8,412	7,987	7,334	8,207	7,665	8,424	8,358	8,073	31,940	32,520	29,562
Income before income taxes	5,330	5,054	3,388	4,462	5,515	5,238	5,065	6,258	18,234	22,076	19,457
Provision for income taxes	1,513	1,459	972	1,163	1,334	1,238	1,229	1,518	5,107	5,319	5,204
Net income	$ 3,817	$ 3,595	$ 2,416	$ 3,299	$ 4,181	$ 4,000	$ 3,836	$ 4,740	$ 13,127	$ 16,757	$ 14,253
Basic earnings per common share	$ 0.25	$ 0.23	$ 0.16	$ 0.21	$ 0.26	$ 0.25	$ 0.24	$ 0.29	$ 0.85	$ 1.04	$ 0.92
Diluted earnings per common share	$ 0.25	$ 0.23	$ 0.16	$ 0.21	$ 0.26	$ 0.24	$ 0.23	$ 0.29	$ 0.85	$ 1.03	$ 0.89