Other Real Estate Owned (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
OREO activity
Balance, beginning of period	$ 63,537,000	$ 107,530,000	$ 79,303,000	$ 129,340,000
Additions	4,953,000	33,436,000	14,629,000	41,728,000
Sales	(4,768,000)	(15,872,000)	(26,943,000)	(37,110,000)
Valuation adjustments	(2,245,000)	(7,593,000)	(5,512,000)	(16,457,000)
Balance, end of period	61,477,000	117,501,000	61,477,000	117,501,000
OREO Valuation Allowances	28,700,000		28,700,000		33,600,000
Non-Covered OREO
OREO activity
Balance, beginning of period	19,786,000	29,074,000	21,027,000	30,790,000
Additions	341,000	10,476,000	723,000	12,693,000
Sales	(390,000)	(1,540,000)	(1,781,000)	(4,417,000)
Valuation adjustments	(61,000)	(3,343,000)	(293,000)	(4,399,000)
Balance, end of period	19,676,000	34,667,000	19,676,000	34,667,000
FDIC reimbursement (as a percent)			80.00%
Payable to FDIC (as a percent)			80.00%
Covered OREO
OREO activity
Balance, beginning of period	43,751,000	78,456,000	58,276,000	98,550,000
Additions	4,612,000	22,960,000	13,906,000	29,035,000
Sales	(4,378,000)	(14,332,000)	(25,162,000)	(32,693,000)
Valuation adjustments	(2,184,000)	(4,250,000)	(5,219,000)	(12,058,000)
Balance, end of period	$ 41,801,000	$ 82,834,000	$ 41,801,000	$ 82,834,000