Allowance for Loan Losses Schedule of Credit Losses on Financing Receivables, Current Period (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for Loan Lease and Other Losses Covered	$ 6,477			$ 9,648
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	47,945	41,070	43,255	36,417
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	6,477	9,648	16,154	20,479
Benefit Attributable to FDIC Loss Share Agreements	(2,319)	(6,218)	(7,858)	(11,117)
Provision for Loan Lease and Other Losses Covered	4,158	3,430	8,296	9,362
Increase in Indemnification Asset	2,319	6,218	7,858	11,117
Allowance for Loan and Lease Losses, Write-offs	(5,353)	(8,112)	(10,340)	(14,290)
Balance at end of the period	$ 49,069	$ 42,606	$ 49,069	$ 42,606