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, 2015	$ 2,955	$ (2,015)	$ 35,097	$ 21,436	$ (1,985)	$ 55,488
Net income				4,979		4,979
Other comprehensive loss					(289)	(289)
ERB acquisition	1,369		33,337			34,706
Restricted stock compensation expense	42		898			940
Exercise of stock options	6		(6)
Shares withheld for employee taxes on stock option exercise and share award vest	(21)		(680)			(701)
Tax benefit for restricted stock vest and stock option exercise			188			188
Cash dividends - common				(895)		(895)
Sale of treasury shares to 401(k)		178	87			265
Sale of treasury shares to deferred comp. plan		107	52			159
Balance at Dec. 31, 2016	4,351	(1,730)	68,973	25,520	(2,274)	94,840
Net income				7,946		7,946
Other comprehensive loss					(116)	(116)
Restricted stock compensation expense	24		535			559
Exercise of stock options	15		(15)
Shares withheld for employee taxes on stock option exercise and share award vest	(11)		(624)			(635)
Cash dividends - common				(1,194)		(1,194)
Sale of treasury shares to 401(k)		197	155			352
Sale of treasury shares to deferred comp. plan		104	86			190
Balance at Dec. 31, 2017	$ 4,379	$ (1,429)	$ 69,110	$ 32,272	$ (2,390)	$ 101,942