Loans (Details Textual) (USD $)	12 Months Ended										12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Acquired Loans	Dec. 31, 2013 Covered Loans	Dec. 31, 2012 Covered Loans	Dec. 31, 2011 Covered Loans	Dec. 31, 2013 Loss Share Receivable	Dec. 31, 2012 Loss Share Receivable	Dec. 31, 2013 Acquired Loans	Dec. 31, 2012 Acquired Loans	Dec. 31, 2013 Covered Loans	Dec. 31, 2012 Covered Loans	Sep. 30, 2012 Covered Loans	Dec. 31, 2013 Impaired loans [Member] Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 6,600,000	$ (6,500,000)
Loans and Leases Receivable, Allowance, Covered				44,027,000	43,255,000	36,417,000					44,027,000	43,255,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference											34,965,000	38,177,000
Loans (Textual) [Abstract]
Outstanding balance, including contractual principal, interest, fees and penalties, of all purchased loans													1,166,570,000	800,000,000
Covered Loans Loss Share Receivable					113,700,000		61,827,000	113,734,000
Loans	$ 14,300,972,000	$ 9,750,784,000	$ 756,100,000						$ 3,495,615,000	$ 0
Time period for non-payment of loans that are placed on non-accrual status	90 days
Days past due for nonaccrual status credit card loans	120 days