Participation In The U.S. Treasury Capital Purchase Program (CPP) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 days years	Dec. 31, 2010	Dec. 23, 2008
Subsequent Event [Line Items]
Cumulative perpetual preferred shares issued	$ 97,718,000	$ 97,718,000	$ 97,290,000
Liquidation preference per senior preferred shares				$ 1,000
Charge to retained earnings representing preferred stock dividend and accretion of discount	1,500,000	2,900,000
Warrant issued to U.S. Treasury relating to CPP		227,376
Issued warrants as a percentage of Senior Preferred Shares purchased		15.00%
Warrant issued to U.S. Treasury relating to CPP, exercise price		$ 65.97
Trailing average in days		20
Term of warrant in years		10
Revised Cumulative Dividends Rate [Member]
Subsequent Event [Line Items]
Preferred stock, dividend rate, percentage		9.00%
Cumulative Dividends Rate [Member]
Subsequent Event [Line Items]
Preferred stock, dividend rate, percentage		5.00%
Cumulative Preferred Stock [Member]
Subsequent Event [Line Items]
Cumulative perpetual preferred shares issued				$ 100,000,000