Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock	Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2015	$ 174	$ 278,333	$ 72,243		$ (9,622)	$ 341,128
Increase (Decrease) in Stockholders' Equity
Net Income			17,480			17,480
Shares issued under the dividend reinvestment plan		447				447
Stock awards granted and distributed	1	(133)		$ 132
Stock awards forfeited		81		(81)
Repurchase of surrendered stock from vesting of restricted stock awards				(308)		(308)
Exercise of stock options		(21)		21
Impact of modification of convertible trust preferred securities		356				356
Share based compensation expense		1,067				1,067
Cash dividend declared, $0.46 per share			(8,053)			(8,053)
Other comprehensive income, net of deferred income taxes					5,964	5,964
Balance at Jun. 30, 2016	175	280,130	81,670	(236)	(3,658)	358,081
Balance at Dec. 31, 2016	191	329,427	91,594	(161)	(13,064)	407,987
Increase (Decrease) in Stockholders' Equity
Net Income			18,012			18,012
Shares issued under the dividend reinvestment plan		469				469
Shares issued for trust preferred securities conversions (529,292 shares)	5	14,944				14,949
Stock awards granted and distributed	1	(416)		415
Stock awards forfeited		20		(20)
Repurchase of surrendered stock from vesting of restricted stock awards				(264)		(264)
Share based compensation expense		1,324				1,324
Cash dividend declared, $0.46 per share			(9,103)			(9,103)
Other comprehensive income, net of deferred income taxes					2,333	2,333
Balance at Jun. 30, 2017	$ 197	$ 345,768	$ 100,503	$ (30)	$ (10,731)	$ 435,707