Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Preferred Stock [Member] Series B Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Warrant [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Series B Preferred Stock [Member]	Total
Balances at Dec. 31, 2010		$ 22,582	$ 197	$ 946	$ 130,382	$ 48,551	$ 2,058		$ 204,716
Net Income						17,384			17,384
Net change in other comprehensive income							2,326		2,326
Stock-based compensation					818				818
Common stock issued					678				678
Shares issued in public offering 1,770,585 shares, net of of issuance costs of $1,384	56,600							56,600
Tax benefits related to non-qualified stock compensation					68				68
Preferred stock dividends						(893)			(893)
Preferred stock:
Issuance of Series B Preferred Stock	56,600							56,600
Redemption of Series A Preferred Stock (23,235 shares)		(23,235)							(23,235)
Discount accretion		653				(653)
Balances at Sep. 30, 2011		56,600	197	946	131,946	64,389	4,384		258,462
Balances at Dec. 31, 2011		56,600	197	946	132,670	71,423	4,875		266,711
Net Income						25,091			25,091
Net change in other comprehensive income							1,151		1,151
Stock-based compensation					2,060				2,060
Common stock issued			2		1,223				1,225
Shares issued in public offering 1,770,585 shares, net of of issuance costs of $1,384			18		28,482				28,500
Tax benefits related to non-qualified stock compensation					87				87
Preferred stock dividends						(426)			(426)
Preferred stock:
Issuance of Series B Preferred Stock			18		28,482				28,500
Balances at Sep. 30, 2012		$ 56,600	$ 217	$ 946	$ 164,522	$ 96,088	$ 6,026		$ 324,399