CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member] Interest Rate Swap [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member] Available-for-sale Securities [Member]	Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2013		$ 28,000	$ 26,462	$ 189,722	$ 83,991		$ 1,397	$ (1,691)	$ (11,182)
Balance at beginning of period, shares at Dec. 31, 2013		28,000	26,461,769						1,363,342
Repurchase of preferred stock		$ (28,000)
Repurchase of preferred stock, Shares		(28,000)
Issuance of common stock			$ 1,599	32,875
Issuance of common stock ,shares			1,598,998
Issuance of restricted shares			$ 77	(77)
Issuance of restricted shares, shares			77,047
Exercise of stock options			$ 32	427
Exercise of stock options, shares			31,784
Stock-based compensation				2,057
Stock-based compensation net tax benefit				0
Forfeitures of restricted shares			$ (11)	11
Forfeitures of restricted shares, shares			(10,571)
Dividends on preferred shares					(286)
Dividends on common shares					(4,016)
Purchase of treasury shares									$ (474)
Purchase of treasury shares,shares									21,822
Net income	$ 38,723				38,723
Change during period	6,392						(889)	7,281
Balance at end of period at Dec. 31, 2014	366,028	$ 0	$ 28,159	225,015	118,412	$ 6,098	508	5,590	$ (11,656)
Balance at end of period, shares at Dec. 31, 2014		0	28,159,027						1,385,164
Repurchase of preferred stock		$ 0
Repurchase of preferred stock, Shares		0
Issuance of common stock			$ 5,320	109,569
Issuance of common stock ,shares			5,320,000
Issuance of restricted shares			$ 71	(71)
Issuance of restricted shares, shares			71,000
Exercise of stock options			$ 75	1,116
Exercise of stock options, shares			75,135
Stock-based compensation				1,485
Stock-based compensation net tax benefit				235
Forfeitures of restricted shares			$ 0	0
Forfeitures of restricted shares, shares			0
Dividends on preferred shares					0
Dividends on common shares					(6,439)
Purchase of treasury shares									$ (732)
Purchase of treasury shares,shares									28,613
Net income	40,847				40,847
Change during period	(2,745)						(356)	(2,389)
Balance at end of period at Dec. 31, 2015	514,759	$ 0	$ 33,625	337,349	152,820	3,353	152	3,201	$ (12,388)
Balance at end of period, shares at Dec. 31, 2015		0	33,625,162						1,413,777
Repurchase of preferred stock		$ 0
Repurchase of preferred stock, Shares		0
Issuance of common stock			$ 2,549	69,906
Issuance of common stock ,shares			2,549,469
Issuance of restricted shares			$ 156	(156)
Issuance of restricted shares, shares			155,751
Exercise of stock options			$ 55	909
Exercise of stock options, shares			54,510
Stock-based compensation				2,261
Stock-based compensation net tax benefit				0
Forfeitures of restricted shares			$ (7)	7
Forfeitures of restricted shares, shares			(7.085)
Dividends on preferred shares					0
Dividends on common shares					(10,466)
Purchase of treasury shares									$ (1,225)
Purchase of treasury shares,shares									42,556
Net income	72,100				72,100
Change during period	(4,411)						24	(4,435)
Balance at end of period at Dec. 31, 2016	$ 646,437	$ 0	$ 36,378	$ 410,276	$ 214,454	$ (1,058)	$ 176	$ (1,234)	$ (13,613)
Balance at end of period, shares at Dec. 31, 2016		0	36,377,807						1,456,333