Quarterly Financial Data (Unaudited) - Summarized Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 14,703	$ 15,112	$ 14,878	$ 14,086	$ 13,820	$ 13,006	$ 12,062	$ 11,180	$ 58,779	$ 50,068	$ 40,283
Interest expense	3,625	3,893	3,701	3,288	2,894	2,521	2,075	1,621	14,507	9,111	4,573
Net interest income	11,078	11,219	11,177	10,798	10,926	10,485	9,987	9,559	44,272	40,957	35,710
Provision for loan losses	411	290	401		220	439	33	575	1,102	1,267	1,311
Net interest income after provision for loan losses	10,667	10,929	10,776	10,798	10,706	10,046	9,954	8,984	43,170	39,690	34,399
Noninterest income	2,513	2,733	2,647	3,533	2,050	2,284	2,783	2,212	11,426	9,329	8,986
Noninterest expense	7,665	8,424	8,358	8,073	7,568	7,705	7,478	6,811	32,520	29,562	26,257
Income before income taxes	5,515	5,238	5,065	6,258	5,188	4,625	5,259	4,385	22,076	19,457	17,128
Provision for income taxes	1,334	1,238	1,229	1,518	1,423	1,144	1,468	1,169	5,319	5,204	7,892
Net income	$ 4,181	$ 4,000	$ 3,836	$ 4,740	$ 3,765	$ 3,481	$ 3,791	$ 3,216	$ 16,757	$ 14,253	$ 9,236
Basic earnings per common share	$ 0.26	$ 0.25	$ 0.24	$ 0.29	$ 0.23	$ 0.22	$ 0.24	$ 0.23	$ 1.04	$ 0.92	$ 0.68
Diluted earnings per common share	$ 0.26	$ 0.24	$ 0.23	$ 0.29	$ 0.23	$ 0.21	$ 0.23	$ 0.22	$ 1.03	$ 0.89	$ 0.66