Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member] Revision of Prior Period, Accounting Standards Update, Adjustment [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member] Revision of Prior Period, Accounting Standards Update, Adjustment [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Beginning balance at Dec. 31, 2018	$ 5,134	$ 24,821		$ 42,525		$ (4,299)	$ (803)	$ 67,378
Beginning balance, shares at Dec. 31, 2018	5,092,048
Net income				5,835				5,835
Other comprehensive income						4,898		4,898
Cash dividends				(4,489)				(4,489)
Stock-based compensation		113						$ 113
Forfeiture of restricted stock, Shares	(800)							(800)
Purchase of treasury stock							(428)	$ (428)
Purchase of treasury stock, shares	(21,508)							(21,508)
Treasury stock issued for stock plans		(28)					428	$ 400
Treasury stock issued for stock plans, shares	22,489
Common stock issued for stock plans	$ 8	(8)
Common stock issued for stock plans, shares	7,500
Ending balance at Dec. 31, 2019	$ 5,142	24,898		43,954		516	(803)	$ 73,707
Ending balance, shares at Dec. 31, 2019	5,099,729							5,099,729
Reclassification for ASU | ASU 2018-02 [Member]			$ 83		$ (83)
Reclassification for ASU								$ 43,954
Net income				5,602				5,602
Other comprehensive income						3,007		3,007
Cash dividends				(4,465)				(4,465)
Stock-based compensation		128						$ 128
Forfeiture of restricted stock, Shares								(565)
Purchase of treasury stock							(1,452)	$ (1,452)
Purchase of treasury stock, shares	(88,277)							(87,712)
Treasury stock issued for stock plans		(6)					76	$ 70
Treasury stock issued for stock plans, shares	4,459
Common stock issued for stock plans	$ 9	(9)
Common stock issued for stock plans, shares	9,530
Ending balance at Dec. 31, 2020	$ 5,151	$ 25,011		$ 45,096		$ 3,518	$ (2,179)	$ 76,597
Ending balance, shares at Dec. 31, 2020	5,025,441							5,025,441
Reclassification for ASU | ASU 2018-02 [Member]			$ 5		$ (5)
Reclassification for ASU								$ 45,096