CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Surplus [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2016						$ (1,531)
Net income	$ 15,922
Comprehensive loss	993					993
Balance at Jun. 30, 2017						(538)
Balance at Mar. 31, 2017						(622)
Net income	7,940
Comprehensive loss	84					84
Balance at Jun. 30, 2017						(538)
Balance at Dec. 31, 2017	403,678	$ 15,858	$ 283,552	$ (8,988)	$ 114,468	(1,212)
Net income	22,717				22,717
Comprehensive loss	(1,669)					(1,669)
Cumulative adjustment for equity security (ASU 2016-01)					(127)	127
Restricted stock units issued 85,242 shares		71	(71)
Restricted stock awards forfeitures, (94,034) shares		(78)	78
Restricted stock units/awards repurchased on vesting to pay taxes, (40,457) shares	(1,403)	(33)	(1,370)
Amortization of restricted stock awards/units	2,130		2,130
Cash dividends declared on common stock ($0.10 per share)	(1,798)				(1,798)
Common stock options exercised, 10,683, net of 2,374 used to exercise, 8,309 shares	102	9	93
Sales of shares (Dividend Reinvestment Program), 392,302 shares	12,733	326	12,407
Issuance of shares for Employee Stock Purchase Plan, 15,490 shares	529	13	516
Issuance of common stock for acquisition 20,826 shares		17	(17)
Balance at Jun. 30, 2018	437,019	16,183	297,318	(8,988)	135,260	(2,754)
Balance at Mar. 31, 2018						(2,842)
Net income	11,910
Comprehensive loss	88					88
Balance at Jun. 30, 2018	$ 437,019	$ 16,183	$ 297,318	$ (8,988)	$ 135,260	$ (2,754)