Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2018	$ 104,348	$ 2,280	$ 20,041	$ 91,635	$ (7,132)	$ (2,476)
Balance (in shares) at Dec. 31, 2018		3,484,080
Net income	12,357			12,357
Other comprehensive loss, net of tax	7,389				7,389
Cash dividends declared	(4,620)			(4,620)
Stock issued in connection with dividend reinvestment and stock purchase plan	863	$ 16	847
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)		24,264
Stock issued for employee stock purchase plan	$ 111	$ 2	109
Stock issued for employee stock purchase plan (in shares)	3,310	3,310
Stock issued for options exercised	$ 151	$ 5	146
Stock issued for options exercised (in shares)	14,925	8,113
Stock-based compensation expense	$ 118		118
Balance at Dec. 31, 2019	120,717	$ 2,303	21,261	99,372	257	(2,476)
Balance (in shares) at Dec. 31, 2019		3,519,767
Net income	12,083			12,083
Other comprehensive loss, net of tax	5,392				5,392
Cash dividends declared	(4,811)			(4,811)
Treasury stock purchase	(130)					(130)
Treasury stock purchase (in shares)		(4,100,000)
Stock issued in connection with dividend reinvestment and stock purchase plan	898	$ 19	879
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)		32,022
Stock issued for employee stock purchase plan	$ 147	$ 4	143
Stock issued for employee stock purchase plan (in shares)	5,723	5,723
Stock issued for options exercised	$ 37	$ 2	35
Stock issued for options exercised (in shares)	9,550	3,121
Stock-based compensation expense	$ 112		112
Balance at Dec. 31, 2020	$ 134,445	$ 2,328	22,430	106,644	5,649	(2,606)
Balance (in shares) at Dec. 31, 2020	3,556,533	3,556,533
Net income	$ 16,492			16,492
Other comprehensive loss, net of tax	(9,389)				(9,389)
Cash dividends declared	(4,973)			(4,973)
Treasury stock purchase	(1,356)					(1,356)
Treasury stock purchase (in shares)		(38,017)
Stock issued in connection with dividend reinvestment and stock purchase plan	841	$ 15	826
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)		23,690
Stock issued for employee stock purchase plan	$ 145	$ 3	142
Stock issued for employee stock purchase plan (in shares)	4,906	4,906
Stock issued for options exercised	$ 187	$ 4	183
Stock issued for options exercised (in shares)	19,025	6,517
Stock-based compensation expense	$ 102		102
Balance at Dec. 31, 2021	$ 136,494	$ 2,350	$ 23,683	$ 118,163	$ (3,740)	$ (3,962)
Balance (in shares) at Dec. 31, 2021	3,553,629	3,553,629