CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Preferred Stock	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2014	$ 11,250	$ 374,287	$ 6,015	$ 72,398	$ (16,717)	$ (1,014)	$ 446,219
Net income				$ 10,379			10,379
Other comprehensive income (loss), net of tax						$ 778	778
Dividend on series B preferred stock				$ (28)			(28)
Cash dividends declared on common stock ($0.075 per share)				$ (2,223)			(2,223)
Exercise of stock options			$ 590				$ 590
Restricted stock grants
Stock-based compensation expense			$ 479				$ 479
Balance at Mar. 31, 2015	$ 11,250	$ 374,287	7,084	$ 80,526	$ (16,717)	$ (236)	456,194
Balance at Dec. 31, 2015	$ 11,250	$ 374,287	$ 8,527	104,606	$ (16,717)	(4,609)	477,344
Net income				10,391			10,391
Other comprehensive income (loss), net of tax						$ (221)	(221)
Dividend on series B preferred stock				(22)			(22)
Cash dividends declared on common stock ($0.075 per share)				$ (2,312)			(2,312)
Redemption of preferred stock	$ (11,250)						(11,250)
Exercise of stock options			$ 42				$ 42
Restricted stock grants
Stock-based compensation expense			$ 755				$ 755
Balance at Mar. 31, 2016		$ 374,287	$ 9,324	$ 112,663	$ (16,717)	$ (4,830)	$ 474,727