Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Dec. 31, 2013	$ 70,787	$ 132,099	$ 167,136	$ 1,900	$ 371,922
Beginning balance, shares at Dec. 31, 2013		19,680
Net income			17,901		17,901
Cash dividends declared ($0.24 per common share)			(4,730)		(4,730)
Preferred dividends			(651)		(651)
Stock-based compensation		$ 341			341
Stock-based compensation, shares		25
Other comprehensive income (loss)				32	32
Ending balance at Sep. 30, 2014	70,787	$ 132,440	179,656	1,932	$ 384,815
Ending balance, shares at Sep. 30, 2014		19,705			19,705,381
Beginning balance at Dec. 31, 2014	70,787	$ 132,532	184,958	(578)	$ 387,699
Beginning balance, shares at Dec. 31, 2014		19,710			19,709,881
Net income			20,237		$ 20,237
Preferred stock redeemed (Series B)	(32,000)				(32,000)
Stock option exercises		$ 32			32
Stock option exercises, shares		2
Cash dividends declared ($0.24 per common share)			(4,743)		(4,743)
Preferred dividends			(566)		(566)
Stock-based compensation		$ 647			647
Stock-based compensation, shares		73
Other comprehensive income (loss)				(132)	(132)
Ending balance at Sep. 30, 2015	$ 38,787	$ 133,211	$ 199,886	$ (710)	$ 371,174
Ending balance, shares at Sep. 30, 2015		19,785			19,785,314