CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Total
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 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)
Stock issuance costs
Redemption of preferred stock	(11,250)						(11,250)
Exercise of stock options (5,495 shares)			42				42
Restricted stock grants (71,920 and 56,164 shares)
Stock-based compensation expense			755				755
Balance at Mar. 31, 2016		374,287	9,324	112,663	(16,717)	(4,830)	474,727
Balance at Dec. 31, 2016		412,726	11,407	126,462	(16,717)	(2,846)	531,032
Net income				11,880			11,880
Other comprehensive loss, net of tax						(441)	(441)
Cash dividends declared on common stock ($0.075 per share)				(2,403)			(2,403)
Stock issuance costs		(180)					(180)
Restricted stock grants (71,920 and 56,164 shares)
Stock-based compensation expense			389				389
Balance at Mar. 31, 2017		$ 412,546	$ 11,796	$ 135,939	$ (16,717)	$ (3,287)	$ 540,277