Other Real Estate Owned (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
OREO activity
Balance, beginning of year	$ 178,164,000	$ 135,551,000	$ 178,183,000	$ 113,866,000
Additions	37,516,000	39,199,000	71,654,000	85,190,000
Sales	(35,919,000)	(9,076,000)	(60,300,000)	(18,381,000)
Valuation adjustments	(17,220,000)	(12,382,000)	(26,996,000)	(27,383,000)
Balance, end of year	162,541,000	153,292,000	162,541,000	153,292,000
OREO Valuation Allowances	32,800,000		32,800,000		5,500,000
Non-Covered OREO
OREO activity
Balance, beginning of year	56,342,000	58,025,000	57,317,000	53,308,000
Additions	3,967,000	6,048,000	10,528,000	27,145,000
Sales	(11,083,000)	(2,185,000)	(17,147,000)	(7,588,000)
Valuation adjustments	(1,592,000)	(7,437,000)	(3,064,000)	(18,414,000)
Balance, end of year	47,634,000	54,451,000	47,634,000	54,451,000
Covered OREO
OREO activity
Balance, beginning of year	121,822,000	77,526,000	120,866,000	60,558,000
Additions	33,549,000	33,151,000	61,126,000	58,045,000
Sales	(24,836,000)	(6,891,000)	(43,153,000)	(10,793,000)
Valuation adjustments	(15,628,000)	(4,945,000)	(23,932,000)	(8,969,000)
Balance, end of year	$ 114,907,000	$ 98,841,000	$ 114,907,000	$ 98,841,000
FDIC reimbursement (as a percent)	80.00%