Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2018	$ 25,853	$ 20,698	$ 57,611	$ (2,156)	$ 102,006
Beginning Balance (in shares) at Dec. 31, 2018	5,170,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	5,885	0	5,885
Other comprehensive income (loss), net of tax	0	0	0	2,822	2,822
Employee Stock Purchase Plan share issuance	$ 14	46	0	0	60
Employee Stock Purchase Plan share issuance (in shares)	2,797
Restricted stock vested	$ 29	(29)	0	0	0
Restricted stock vested (in shares)	5,839
Stock-based compensation expense	$ 0	161	0	0	161
Cash dividends	0	0	(1,871)	0	(1,871)
Ending Balance at Sep. 30, 2019	$ 25,896	20,876	61,625	666	109,063
Ending Balance (in shares) at Sep. 30, 2019	5,179,236
Beginning Balance at Jun. 30, 2019	$ 25,892	20,838	60,016	679	107,425
Beginning Balance (in shares) at Jun. 30, 2019	5,178,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	2,232	0	2,232
Other comprehensive income (loss), net of tax	0	0	0	(13)	(13)
Employee Stock Purchase Plan share issuance	$ 4	16	0	0	20
Employee Stock Purchase Plan share issuance (in shares)	897
Restricted stock vested	$ 0	0	0	0	0
Restricted stock vested (in shares)	0
Stock-based compensation expense	$ 0	22	0	0	22
Cash dividends	0	0	(623)	0	(623)
Ending Balance at Sep. 30, 2019	$ 25,896	20,876	61,625	666	109,063
Ending Balance (in shares) at Sep. 30, 2019	5,179,236
Beginning Balance at Dec. 31, 2019	$ 25,901	20,959	62,975	(79)	$ 109,756
Beginning Balance (in shares) at Dec. 31, 2019	5,180,105				5,200,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	4,844	0	$ 4,844
Other comprehensive income (loss), net of tax	0	0	0	3,883	3,883
Employee Stock Purchase Plan share issuance	$ 21	49	0	0	70
Employee Stock Purchase Plan share issuance (in shares)	4,185
Restricted stock vested	$ 42	(42)	0	0	0
Restricted stock vested (in shares)	8,519
Stock-based compensation expense	$ 0	199	0	0	199
Cash dividends	0	0	(1,877)	0	(1,877)
Ending Balance at Sep. 30, 2020	$ 25,964	21,165	65,942	3,804	$ 116,875
Ending Balance (in shares) at Sep. 30, 2020	5,192,809				5,222,385
Beginning Balance at Jun. 30, 2020	$ 25,956	21,093	65,468	3,352	$ 115,869
Beginning Balance (in shares) at Jun. 30, 2020	5,191,217
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	1,100	0	1,100
Other comprehensive income (loss), net of tax	0	0	0	452	452
Employee Stock Purchase Plan share issuance	$ 8	16	0	0	24
Employee Stock Purchase Plan share issuance (in shares)	1,592
Restricted stock vested	$ 0	0	0	0	0
Restricted stock vested (in shares)	0
Stock-based compensation expense	$ 0	56	0	0	56
Cash dividends	0	0	(626)	0	(626)
Ending Balance at Sep. 30, 2020	$ 25,964	$ 21,165	$ 65,942	$ 3,804	$ 116,875
Ending Balance (in shares) at Sep. 30, 2020	5,192,809				5,222,385