Covered Assets and FDIC Loss-sharing Asset (Covered OREO at Carrying Value) (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]
Balance, beginning of period			$ 26,987
Proceeds from sale of OREO property			(10,779)	(15,069)
Gain on sale of OREO			8,745	8,604
Total OREO, end of period	36,273		36,273
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance, beginning of period	12,854	19,079	16,311	28,126
Transfers in	3,559	3,096	8,089	8,497
Additional OREO write-down	(199)	(730)	(293)	(2,769)
Proceeds from sale of OREO property	(5,408)	(6,822)	(19,222)	(25,202)
Gain on sale of OREO	1,924	1,888	7,845	7,859
Total OREO, end of period	$ 12,730	$ 16,511	$ 12,730	$ 16,511