Covered Assets and FDIC Loss-sharing Asset Covered Assets and FDIC Loss-sharing Asset (Changes in Allowance for Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision (recapture) for loan and lease losses	$ (101)	$ 39,367	$ 5,752
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	30,056	4,944	6,055
Loans charged off	(13,853)	(5,112)	(1,488)
Recoveries	(7,232)	(4,332)	(2,025)
Provision (recapture) for loan and lease losses	(3,261)	25,892	(1,648)
Balance at the end of year	$ 20,174	$ 30,056	$ 4,944