Other Real Estate Owned (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
OREO activity
Balance, beginning of period	$ 61,477,000	$ 117,501,000	$ 79,303,000	$ 129,340,000
Additions	4,008,000	16,474,000	18,637,000	58,202,000
Sales	(15,206,000)	(18,302,000)	(42,149,000)	(55,413,000)
Valuation adjustments	(1,556,000)	(5,000,000)	(7,068,000)	(21,456,000)
Balance, end of period	48,723,000	110,673,000	48,723,000	110,673,000
OREO Valuation Allowances	20,000,000		20,000,000		33,600,000
Non-Covered OREO
OREO activity
Balance, beginning of period	19,676,000	34,667,000	21,027,000	30,790,000
Additions		1,485,000	723,000	14,177,000
Sales	(771,000)	(8,364,000)	(2,552,000)	(12,781,000)
Valuation adjustments		(733,000)	(293,000)	(5,131,000)
Balance, end of period	18,905,000	27,055,000	18,905,000	27,055,000
FDIC reimbursement (as a percent)			80.00%
Payable to FDIC (as a percent)			80.00%
Covered OREO
OREO activity
Balance, beginning of period	41,801,000	82,834,000	58,276,000	98,550,000
Additions	4,008,000	14,989,000	17,914,000	44,025,000
Sales	(14,435,000)	(9,938,000)	(39,597,000)	(42,632,000)
Valuation adjustments	(1,556,000)	(4,267,000)	(6,775,000)	(16,325,000)
Balance, end of period	$ 29,818,000	$ 83,618,000	$ 29,818,000	$ 83,618,000