Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Preferred Stock [Member]	Common Stock [Member]	Warrant [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2012	$ 56,600	$ 226	$ 946	$ 180,593	$ 106,146	$ 5,465	$ 349,976
Net Income					23,247		23,247
Net change in other comprehensive income						(6,372)	(6,372)
10% common stock dividend 2,340,518 shares (in Shares)		23		56,161	(56,184)
Cash paid in lieu of fractional shares					(10)		(10)
Stock-based compensation				1,552			1,552
Shares issued under equity compensation plans		2		755			757
Tax benefits related to non-qualified stock compensation				270			270
Employee stock purchase plan				253			253
Preferred stock dividends					(283)		(283)
Ending Balance at Jun. 30, 2013	56,600	251	946	239,584	72,916	(907)	369,390
Beginning Balance at Dec. 31, 2013	56,600	253	946	242,990	96,393	(3,319)	393,863
Net Income					25,443		25,443
Net change in other comprehensive income						5,157	5,157
Stock-based compensation				1,915			1,915
Shares issued under equity compensation plans		2		303			305
Tax benefits related to non-qualified stock compensation				123			123
Employee stock purchase plan				298			298
Preferred stock dividends					(283)		(283)
Ending Balance at Jun. 30, 2014	$ 56,600	$ 255	$ 946	$ 245,629	$ 121,553	$ 1,838	$ 426,821