Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Covered Assets And FDIC Loss Sharing Asset
Balance at beginning of period	$ 27,981	$ 67,374	$ 39,846	$ 96,354
Cash received from the FDIC	541	(1,484)	(1,223)	(7,871)
FDIC reimbursable losses, net	(214)	(505)	(446)	522
Amortization, net	(3,992)	(9,890)	(16,208)	(29,470)
Impairment	(416)	(758)	2,735	(1,343)
Sale of other real estate	(383)	(1,479)	(2,104)	(5,076)
Write-downs of other real estate	67	220	860	373
Other	(92)	81	32	70
Balance at end of period	$ 23,492	$ 53,559	$ 23,492	$ 53,559