Covered Assets and FDIC Loss-sharing Asset (Changes in Allowance for Covered Loans) (Details) (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 Assets And FDIC Loss Sharing Asset [Line Items]
Provision for loan and lease losses			$ 3,581	$ 34,506
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Beginning balance	26,135	31,784	30,056	4,944
Loans charged off	(5,006)	(977)	(10,031)	(2,574)
Recoveries	2,555	2,342	4,391	3,406
Provision for loan and lease losses	(947)	(3,992)	(1,679)	23,381
Ending balance	$ 22,737	$ 29,157	$ 22,737	$ 29,157