Loans Details Narrative (Details) (USD $)	3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Covered Loans [Member]	Jun. 30, 2012 Covered Loans [Member]	Jun. 30, 2013 Covered Loans [Member]	Jun. 30, 2012 Covered Loans [Member]	Jun. 30, 2013 Covered Loans [Member]	Jun. 30, 2012 Covered Loans [Member]	Jun. 30, 2013 Covered Loans [Member]	Jun. 30, 2012 Covered Loans [Member]	Jun. 30, 2013 Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer Loans Guaranteed by Government	$ 3,100,000	$ 3,100,000	$ 3,500,000	$ 3,400,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference									5,413,000	12,993,000	15,982,000	24,806,000
Covered Loans Loss Share Receivable	83,900,000	83,900,000	152,600,000	113,700,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	6,700,000	6,700,000	(6,600,000)	6,500,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements					6,477,000	9,648,000	16,154,000	20,479,000
Provision for Loan Lease and Other Losses Covered	6,477,000		9,648,000		4,158,000	3,430,000	8,296,000	9,362,000
Loans Due Ninety Days or More or on Nonaccrual Status		90 days
Days past due for nonaccrual status credit card loans		120 days
Acquired Loans Total	$ 14,151,953,000	$ 14,151,953,000	$ 9,371,816,000	$ 9,750,784,000									$ 4,258,892,000