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			26,331			26,331
Shares issued under the dividend reinvestment plan		688				688
Shares issued for trust preferred securities conversions (529,292 and 6,896 shares for September 30, 2017 & September 30, 2016, respectively)		195				195
Stock awards granted and distributed	1	(176)		$ 175
Stock awards forfeited		173		(173)
Repurchase of surrendered stock from vesting of restricted stock awards				(328)		(328)
Exercise of stock options		(29)		29
Impact of modification of convertible trust preferred securities		356				356
Share based compensation expense		1,597				1,597
Cash dividend declared, $0.69 per share			(12,095)			(12,095)
Other comprehensive income, net of deferred income taxes					4,730	4,730
Balance at Sep. 30, 2016	175	281,137	86,479	(297)	(4,892)	362,602
Balance at Dec. 31, 2016	191	329,427	91,594	(161)	(13,064)	407,987
Increase (Decrease) in Stockholders' Equity
Net income			27,455			27,455
Shares issued under the dividend reinvestment plan		721				721
Shares issued for trust preferred securities conversions (529,292 and 6,896 shares for September 30, 2017 & September 30, 2016, respectively)	5	14,944				14,949
Stock awards granted and distributed	1	(417)		416
Stock awards forfeited		131		(131)
Repurchase of surrendered stock from vesting of restricted stock awards				(330)		(330)
Share based compensation expense		1,972				1,972
Cash dividend declared, $0.69 per share			(13,670)			(13,670)
Other comprehensive income, net of deferred income taxes					2,855	2,855
Balance at Sep. 30, 2017	$ 197	$ 346,778	$ 105,379	$ (206)	$ (10,209)	$ 441,939