Covered Assets and FDIC Loss-sharing Asset (Changes in Allowance for Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Provision for loan and lease losses	$ 1,922	$ (20)
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Beginning balance	20,174	30,056
Loans charged off	(4,273)	(2,382)
Recoveries	1,806	835
Provision for loan and lease losses	2,422	980
Ending balance	$ 20,129	$ 29,489