Shareholders' Equity (Details) (USD $)	0 Months Ended		12 Months Ended
	Apr. 29, 2010	Dec. 05, 2008	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common stock issued, shares	4,600,000
Shares issued pursuant to the underwriter’s over-allotment option	600,000
Shares issued, price per share	$ 12.50
Shares issued, aggregate proceeds	$ 57,500,000
Net proceeds from issuance of common stock	54,000,000		127,000	64,000	54,315,000
Investment in subsidiary banks	25,000,000
Preferred stock share issued		70,000	0	70,000
Preferred stock par value		$ 1,000	$ 1,000
Preferred stock liquidation amount per share		$ 1,000
Preferred stock liquidation amount		70,000,000
Preferred stock dividend percentage		5.00%
Preferred stock dividend percentage, thereafter		9.00%
Preferred stock redemption restriction period			5 years
Warrant issued		703,753
Warrant exercise price		$ 14.92
Warrant expiration period		10 years
Preferred stock allocated amount		3,700,000
Preferred Stock, Accretion of Redemption Discount			1,500,000	700,000	700,000
Amount of Treasury Department Shares Repurchased			70,000
Accelerated accretion of discount from repurchase of Treasury Department Shares			1,200,000
Series B Preferred Stock [Member]
Preferred stock allocated amount		$ 66,300,000
Employee Stock Purchase Plan [Member]
Common stock reserved for issuance			150,000
Common stock issued, shares			53,961
Treasury shares reissued			52,500
1999 Stock Purchase Plan [Member]
Common stock reserved for issuance			1,960,000
Common stock issued, shares			275,255
Treasury shares reissued			1,622,385
2008 Stock Based Award Plan [Member]
Common stock reserved for issuance			800,000
Common stock issued, shares			122,881
Treasury shares reissued			25,725