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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset
Balance at beginning of period	$ 67,374	$ 140,003	$ 96,354	$ 175,071
Cash received from the FDIC	(1,484)	(14,881)	(7,871)	(49,194)
FDIC reimbursable losses, net	(505)	(494)	522	587
Amortization, net	(9,890)	(9,694)	(29,470)	(33,418)
Impairment	(758)	(3,193)	(1,343)	18,705
Sale of other real estate	(1,479)	(1,315)	(5,076)	(4,881)
Write-downs of other real estate	220	1,141	373	4,503
Other	81	110	70	304
Balance at end of period	$ 53,559	$ 111,677	$ 53,559	$ 111,677