Covered Assets and FDIC Loss-sharing Asset (Covered OREO at Carrying Value) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance, beginning of period			$ 26,987
Proceeds from sale of OREO property			(6,076)	(11,899)
Gain on sale of OREO			6,291	6,277
Total OREO, end of period	37,193		37,193
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance, beginning of period	13,811	24,430	16,311	28,126
Transfers in	3,125	2,933	4,530	5,401
Additional OREO write-down	(29)	(533)	(94)	(2,038)
Proceeds from sale of OREO property	(7,376)	(10,356)	(13,814)	(18,381)
Gain on sale of OREO	3,323	2,605	5,921	5,971
Total OREO, end of period	$ 12,854	$ 19,079	$ 12,854	$ 19,079