Consolidated Statements of 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, 2015	$ 2,955	$ (2,015)	$ 35,097	$ 21,436	$ (1,985)	$ 55,488
Net income				2,666		2,666
Other comprehensive income					914	914
Restricted stock compensation expense	36		765			801
Taxes on exercise of stock options and share award vest	(16)		(421)			(437)
Tax benefit for restricted stock vest			64			64
Cash dividends - common				(598)		(598)
Sale of treasury shares to 401(k)		130	68			198
Sale of treasury shares to deferred comp. plan		80	41			121
Balance at Sep. 30, 2016	2,975	(1,805)	35,614	23,504	(1,071)	59,217
Balance at Dec. 31, 2016	4,351	(1,730)	68,973	25,520	(2,274)	94,840
Net income				7,138		7,138
Other comprehensive income					264	264
Restricted stock compensation expense	13		308			321
Exercise of stock options	9		(9)
Taxes on exercise of stock options and share award vest			(189)			(189)
Cash dividends - common				(895)		(895)
Sale of treasury shares to 401(k)		151	62			213
Sale of treasury shares to deferred comp. plan		77	115			192
Balance at Sep. 30, 2017	$ 4,373	$ (1,502)	$ 69,260	$ 31,763	$ (2,010)	$ 101,884