Allowance for Loan Losses (Schedule of Credit Losses Related to Covered Financing Receivables, Current) (Details) (Covered Loans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Covered Loans
Schedule of Allowance for Loan Losses Related to Covered Financing Receivables, Current [Line Items]
Loans and Leases Receivable, Allowance, Covered	$ 40,496	$ 44,027	$ 43,255	$ 36,417
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	10,568	23,892	35,450
Benefit Attributable to FDIC Loss Share Agreements	2,920	(10,790)	(14,728)
Provision for Loan Lease and Other Losses Covered	7,648	13,102	20,722
Increase in Indemnification Asset	2,920	10,790	14,728
Allowance for Loan and Lease Losses, Write-offs	$ 14,099	$ (23,120)	$ (28,612)