Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Beginning balance at Dec. 31, 2017	$ 626	$ 47,431	$ 70,426	$ (77)	$ (2,667)	$ 115,739
Beginning balance, shares at Dec. 31, 2017	6,256,063			2,608
Net income			3,129			3,129
Other comprehensive income (loss)					(3,660)	(3,660)
Cash dividends declared			(1,376)			(1,376)
Compensation expense related to restricted stock		51				51
Acquisition of treasury stock				$ (179)		(179)
Acquisition of treasury stock, shares				5,446
Stock options exercised		7		$ 68		75
Stock options exercised, shares	1,500			2,325
Compensation expense related to stock options		59				59
Ending balance, shares at Mar. 31, 2018	6,257,563			5,729
Ending balance at Mar. 31, 2018	$ 626	47,548	72,179	$ (188)	(6,327)	113,838
Beginning balance at Dec. 31, 2018	$ 630	48,322	78,434	$ (81)	(5,020)	122,285
Beginning balance, shares at Dec. 31, 2018	6,295,113			2,470
Net income			3,190			3,190
Other comprehensive income (loss)					2,943	2,943
Cash dividends declared			(1,509)			(1,509)
Compensation expense related to restricted stock		72				72
Acquisition of treasury stock				$ (374)		(374)
Acquisition of treasury stock, shares				11,337
Stock options exercised		113				$ 113
Stock options exercised, shares	6,150					6,150
Compensation expense related to stock options		52				$ 52
Ending balance, shares at Mar. 31, 2019	6,301,263			13,807
Ending balance at Mar. 31, 2019	$ 630	$ 48,559	$ 80,115	$ (455)	$ (2,077)	$ 126,772