Quarterly Financial Comparison (Unaudited) (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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Interest and dividend income	$ 18,279	$ 18,259	$ 18,118	$ 17,797	$ 17,043	$ 16,484	$ 15,754	$ 15,892	$ 13,573	$ 13,680	$ 13,395	$ 12,922	$ 72,453	$ 65,173	$ 53,570
Interest expense	4,566	4,734	4,859	4,760	4,217	3,724	3,343	3,002	2,800	2,672	2,462	2,248	18,919	14,286	10,182
Net interest income	13,713	13,525	13,259	13,037	12,826	12,760	12,411	12,890	10,773	11,008	10,933	10,674	53,534	50,887	43,388
Provision for loan losses	805	450	375	500	465	40	400	500	30	224	376	380	2,130	1,405	1,010
Net interest income after provision	12,908	13,075	12,884	12,537	12,361	12,720	12,011	12,390	10,743	10,784	10,557	10,294	51,404	49,482	42,378
Noninterest income	2,213	1,239	1,253	1,061	1,067	1,069	901	1,031	993	1,157	1,043	848	5,766	4,068	4,041
Noninterest expense	9,488	9,224	9,116	8,405	8,240	8,491	9,750	11,668	7,739	7,442	7,521	7,352	36,233	38,149	30,054
Income before income taxes	5,633	5,090	5,021	5,193	5,188	5,298	3,162	1,753	3,997	4,499	4,079	3,790	20,937	15,401	16,365
Provision for income taxes	1,558	1,397	1,394	1,316	1,371	1,441	828	533	4,456	1,717	1,536	1,448	$ 5,665	$ 4,173	$ 9,157
Net Income Available to Common Stockholders	$ 4,075	$ 3,693	$ 3,627	$ 3,877	$ 3,817	$ 3,857	$ 2,334	$ 1,220	$ (459)	$ 2,782	$ 2,543	$ 2,342
Earnings Per Common Share
Basic	$ 0.73	$ 0.66	$ 0.65	$ 0.70	$ 0.69	$ 0.70	$ 0.42	$ 0.22	$ (0.10)	$ 0.60	$ 0.55	$ 0.51	$ 2.75	$ 2.02	$ 1.56
Diluted	$ 0.73	$ 0.66	$ 0.65	$ 0.70	$ 0.69	$ 0.70	$ 0.42	$ 0.22	$ (0.10)	$ 0.60	$ 0.55	$ 0.51	$ 2.75	$ 2.02	$ 1.56