Consolidated Statements of Changes in Stockholders' Equity - 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, 2019	$ 25,901	$ 20,959	$ 62,975	$ (79)	$ 109,756
Beginning Balance (in shares) at Dec. 31, 2019	5,180,105
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
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
Beginning Balance at Dec. 31, 2020	$ 25,972	21,245	65,859	4,069	$ 117,145
Beginning Balance (in shares) at Dec. 31, 2020	5,194,443				5,224,019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	6,762	0	$ 6,762
Other comprehensive income (loss), net of tax	0	0	0	(1,495)	(1,495)
Employee Stock Purchase Plan share issuance	$ 19	60	0	0	79
Employee Stock Purchase Plan share issuance (in shares)	3,775
Restricted stock vested	$ 43	(43)	0	0	0
Restricted stock vested (in shares)	8,521
Stock-based compensation expense	$ 0	214	0	0	214
Cash dividends	0	0	(1,938)	0	(1,938)
Ending Balance at Sep. 30, 2021	$ 26,034	21,476	70,683	2,574	$ 120,767
Ending Balance (in shares) at Sep. 30, 2021	5,206,739				5,245,842
Beginning Balance at Jun. 30, 2021	$ 26,028	21,372	69,457	3,071	$ 119,928
Beginning Balance (in shares) at Jun. 30, 2021	5,205,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	1,908	0	1,908
Other comprehensive income (loss), net of tax	0	0	0	(497)	(497)
Employee Stock Purchase Plan share issuance	$ 6	20	0	0	26
Employee Stock Purchase Plan share issuance (in shares)	1,207
Restricted stock vested	$ 0	0	0	0	0
Restricted stock vested (in shares)	0
Stock-based compensation expense	$ 0	84	0	0	84
Cash dividends	0	0	(682)	0	(682)
Ending Balance at Sep. 30, 2021	$ 26,034	$ 21,476	$ 70,683	$ 2,574	$ 120,767
Ending Balance (in shares) at Sep. 30, 2021	5,206,739				5,245,842