Selected Quarterly Financial Data (Unaudited) (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
Selected Quarterly Financial Data (Unaudited) [Abstract]
Net interest income	$ 12,199	$ 11,601	$ 11,929	$ 11,432	$ 10,657	$ 10,600	$ 10,583	$ 10,353	$ 47,161	$ 42,193	$ 39,631
Provision for loan losses	2,050	1,250	1,400	650	0	0	0	0	5,350	0	200
Noninterest income	700	334	301	330	281	509	295	223	1,665	1,308	1,331
Noninterest expense	4,532	4,584	4,123	4,353	4,557	16,072	4,048	3,755	17,592	28,432	14,965
Income (loss) before income taxes	6,317	6,101	6,707	6,759	6,381	(4,963)	6,830	6,821	25,884	15,069	25,797
Income tax expense	1,578	1,661	1,671	1,708	1,879	1,556	1,704	1,705	6,618	6,844	797
Net income (loss)	$ 4,739	$ 4,440	$ 5,036	$ 5,051	$ 4,502	$ (6,519)	$ 5,126	$ 5,116	$ 19,266	$ 8,225	$ 25,000
EPS [Abstract]
Basic (in dollars per share)	$ 0.52	$ 0.48	$ 0.54	$ 0.51	$ 0.45	$ (0.64)	$ 0.50	$ 0.50	$ 2.05	$ 0.81	$ 3.08
Diluted (in dollars per share)	$ 0.52	$ 0.48	$ 0.54	$ 0.51	$ 0.45	$ (0.64)	$ 0.50	$ 0.50	$ 2.05	$ 0.81	$ 3.03