Allowance for Loan Losses Schedule of Credit Losses on Financing Receivables, Current Period (Details) (Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	$ 49,069	$ 42,606	$ 43,255	$ 36,417
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	2,855	7,698	19,009	28,177
Benefit Attributable to FDIC Loss Share Agreements	(1,032)	(1,484)	(8,890)	(12,601)
Provision for Loan Lease and Other Losses Covered	1,823	6,214	10,119	15,576
Increase in Indemnification Asset	(1,032)	(1,484)	(8,890)	(12,601)
Allowance for Loan and Lease Losses, Write-offs	(6,380)	(6,660)	(16,720)	(20,950)
Balance at end of the period	$ 45,544	$ 43,644	$ 45,544	$ 43,644