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				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
Net income				10,684		10,684
Other comprehensive loss					(110)	(110)
Restricted stock compensation expense	11		304			315
Exercise of stock options	8		(8)
Shares withheld for employee taxes on stock option exercise and share award vest	(7)		(358)			(365)
Cash dividends - common				(1,204)		(1,204)
Sale of treasury shares to 401(k)		202	191			393
Sale of treasury shares to deferred comp. plan		97	94			191
Adoption impact - ASU 2018-02				471	(471)
Balance at Dec. 31, 2018	$ 4,391	$ (1,130)	$ 69,333	$ 42,223	$ (2,971)	$ 111,846