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
Balances at Dec. 31, 2011	$ 56,600	$ 197	$ 946	$ 132,670	$ 71,423	$ 4,875	$ 266,711
Net Income					15,416		15,416
Net change in other comprehensive income						518	518
Stock-based compensation				1,627			1,627
Common stock issued under equity compensation plans		2		471			473
Common stock issued 364,691 shares (in Shares)		4		5,488			5,492
Tax benefits related to non-qualified stock compensation				27			27
Employee stock purchase plan				289			289
Preferred stock dividends					(283)		(283)
Balances at Jun. 30, 2012	56,600	203	946	140,572	86,556	5,393	290,270
Balances 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		23		56,161	(56,184)
Cash paid in lieu of fractional shares					(10)		(10)
Stock-based compensation				1,552			1,552
Common stock 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)
Balances at Jun. 30, 2013	$ 56,600	$ 251	$ 946	$ 239,584	$ 72,916	$ (907)	$ 369,390