CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member]	Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2013		$ 28,000	$ 26,462	$ 189,722	$ 83,991	$ (294)	$ (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)
Net income	$ 28,143				28,143
Other comprehensive income (loss) during the period	4,268					4,268
Purchase of treasury shares							$ (432)
Purchase of treasury shares,shares							(20,154)
Stock-based compensation				1,230
Issuance of common stock			$ 1,599	32,875
Issuance of common stock, Shares			1,598,998
Proceeds from exercise of stock options			$ 29	383
Proceeds from exercise of stock options,shares			29,084
Issuance of restricted shares			$ 68	(68)
Issuance of restricted shares,shares			68,047
Dividends on preferred shares					(286)
Dividends on common shares					(2,678)
Balance at end of period at Sep. 30, 2014	353,830	$ 0	$ 28,158	224,142	109,170	3,974	$ (11,614)
Balance at end of period, shares at Sep. 30, 2014		0	28,157,898				(1,383,496)
Balance at beginning of period at Dec. 31, 2014	366,028	$ 0	$ 28,159	225,015	118,412	6,098	$ (11,656)
Balance at beginning 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
Net income	26,699				26,699
Other comprehensive income (loss) during the period	(1,901)					(1,901)
Purchase of treasury shares							$ (732)
Purchase of treasury shares,shares							(28,613)
Stock-based compensation				1,140
Issuance of common stock			$ 5,320	109,569
Issuance of common stock, Shares			5,320,000
Proceeds from exercise of stock options			$ 60	946
Proceeds from exercise of stock options,shares			59,867
Issuance of restricted shares			$ 71	(71)
Issuance of restricted shares,shares			71,000
Dividends on preferred shares					0
Dividends on common shares					(4,829)
Balance at end of period at Sep. 30, 2015	$ 502,300	$ 0	$ 33,610	$ 336,599	$ 140,282	$ 4,197	$ (12,388)
Balance at end of period, shares at Sep. 30, 2015		0	33,609,894				(1,413,777)