Loans (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Feb. 19, 2010 George Washington Transaction [Member]	Jun. 30, 2011 Midwest Transaction [Member]	May 14, 2010 Midwest Transaction [Member]	Feb. 19, 2010 First Bank Branches [Member]	Jun. 30, 2011 Acquired Loans With Revolving Privileges [Member]	Jun. 30, 2011 Acquired Loans (Noncovered) [Member]	Dec. 31, 2010 Acquired Loans (Noncovered) [Member]	Jun. 30, 2010 Acquired Loans (Noncovered) [Member]
Loans (Textuals) [Abstract]
Total Loans											$ 192,204,000	$ 265,501,000	$ 323,500,000
Loss share receivable	239,000,000	344,000,000	239,000,000	344,000,000	289,000,000
Net of deferred loan origination fee and cost	5,100,000	1,700,000	5,100,000	1,700,000	3,600,000
Amortization of loss share through interest income on acquired loans	0
Loans payments past due			90 days
Credit card loans past due			120 days
Investment in nonaccrual loans		98,900,000		98,900,000							861,000	93,000
Accruing interest on investment		36,900,000		36,900,000							2,917,000	810,000
Bank acquired loans						275,600,000		1,800,000,000	177,800,000	162,600,000
Outstanding balance, including contractual principal, interest, fees and penalties, of all purchased loans							1,900,000,000
Interest income	$ 99,824,000	$ 96,134,000	$ 199,301,000	$ 161,035,000