Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	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, 2012		$ 27,662	$ 25,155	$ 164,949	$ 65,710	$ 6,607	$ (11,066)
Balance at beginning of period, shares at Dec. 31, 2012		28,000	25,154,818				(1,355,050)
Stock-based compensation				592
Net income	18,640				18,640
Other comprehensive income (loss)	(7,138)					(7,138)
Issuance of restricted shares			83	(83)
Purchase of treasury shares							(116)
Issuance of restricted shares, shares			83,400
Purchase of treasury shares, shares							(8,292)
Dividends on preferred shares					(1,050)
Cancellation of restricted shares			(1)	1
Accretion of fair value of warrant		276			(275)
Cancellation of restricted shares, shares			(1,000)
Proceeds from exercise of stock options			34	376
Proceeds from exercise of stock options, shares			33,633
Balance at end of period at Sep. 30, 2013	290,356	27,938	25,271	165,835	83,025	(531)	(11,182)
Balance at end of period, shares at Sep. 30, 2013		28,000	25,270,851				(1,363,342)
Balance at beginning of period at Dec. 31, 2013	316,699	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)
Stock-based compensation				1,230
Net income	28,143				28,143
Other comprehensive income (loss)	4,268					4,268
Issuance of restricted shares			68	(68)
Repurchase of preferred stock		(28,000)
Purchase of treasury shares							(432)
Cash dividends declared, $0.10 per share					(2,678)
Issuance of restricted shares, shares			68,047
Repurchase of preferred stock, shares		(28,000)
Purchase of treasury shares, shares							(20,154)
Dividends on preferred shares					(286)
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
Balance at end of period at Sep. 30, 2014	$ 353,830		$ 28,158	$ 224,142	$ 109,170	$ 3,974	$ (11,614)
Balance at end of period, shares at Sep. 30, 2014			28,157,898				(1,383,496)