Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2016	$ 4,351	$ (1,730)	$ 68,973	$ 25,520	$ (2,274)	$ 94,840
Net income				4,727		4,727
Other comprehensive income (loss)					154	154
Restricted stock compensation expense	8		206			214
Exercise of stock options	9		(9)
Taxes on exercise of stock options			(187)			(187)
Cash dividends - common				(596)		(596)
Sale of treasury shares to 401(k)		98	37			135
Sale of treasury shares to deferred comp. plan		50	68			118
Balance at Jun. 30, 2017	4,368	(1,582)	69,088	29,651	(2,120)	99,405
Balance at Dec. 31, 2017	4,379	(1,429)	69,110	32,272	(2,390)	101,942
Net income				4,662		4,662
Other comprehensive income (loss)					(987)	(987)
Restricted stock compensation expense	8		196			204
Exercise of stock options	2		(2)
Taxes on exercise of stock options	(4)		(176)			(180)
Cash dividends - common				(601)		(601)
Sale of treasury shares to 401(k)		102	92			194
Sale of treasury shares to deferred comp. plan		51	48			99
Adoption impact - ASU 2018-02				471	(471)
Balance at Jun. 30, 2018	$ 4,385	$ (1,276)	$ 69,268	$ 36,804	$ (3,848)	$ 105,333