Covered Assets and FDIC Loss-sharing Asset (Changes in Allowance for Covered Loans) (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
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Provision for loan and lease losses			$ 268	$ 35,623
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Beginning balance	29,489	20,504	30,056	4,944
Loans charged off	(2,642)	(1,035)	(5,024)	(1,597)
Recoveries	1,000	627	1,835	1,064
Provision for loan and lease losses	(1,712)	11,688	(732)	27,373
Ending balance	$ 26,135	$ 31,784	$ 26,135	$ 31,784