Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance, preferred stock, shares at Dec. 31, 2013		0
Beginning balance, common stock, shares at Dec. 31, 2013			24,224,151
Beginning balance at Dec. 31, 2013	$ 386,623	$ 0	$ 24,756	$ 307,231	$ 71,008	$ (8,118)	$ (8,254)
Net income	18,374				18,374
Other comprehensive loss	5,898					5,898
Stock dividend, shares			2,429,375
Stock dividend	(8)		$ 2,429	43,364	(45,801)
Share-based compensation expense	2,034			2,034
Issuance of common stock under share-based compensation arrangements, Shares			75,834
Issuance of common stock under share-based compensation arrangements	819		$ 77	742
Ending balance, preferred stock, shares at Jun. 30, 2014		0
Ending balance, common stock, shares at Jun. 30, 2014			26,729,360
Ending balance at Jun. 30, 2014	$ 413,740	$ 0	$ 27,262	353,371	43,581	(2,220)	(8,254)
Beginning balance, preferred stock, shares at Dec. 31, 2014		0
Beginning balance, common stock, shares at Dec. 31, 2014	26,745,529		26,745,529
Beginning balance at Dec. 31, 2014	$ 443,145	$ 0	$ 27,278	355,822	68,421	(122)	(8,254)
Net income	25,508				25,508
Other comprehensive loss	(3,992)					(3,992)
Issuance of preferred stock, net of offering costs, shares		2,300,000
Issuance of preferred stock, net of offering costs	55,569	$ 55,569
Preferred stock dividend	(507)				(507)
Share-based compensation expense	2,359			2,359
Issuance of common stock under share-based compensation arrangements, Shares			126,216
Issuance of common stock under share-based compensation arrangements	$ 1,419		$ 124	1,274			21
Ending balance, preferred stock, shares at Jun. 30, 2015		2,300,000
Ending balance, common stock, shares at Jun. 30, 2015	26,871,745		26,871,745
Ending balance at Jun. 30, 2015	$ 523,501	$ 55,569	$ 27,402	$ 359,455	$ 93,422	$ (4,114)	$ (8,233)