OREO (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Real Estate [Roll Forward]
Beginning balance	$ 98,187,000	$ 183,452,000	$ 91,476,000
Additions	33,499,000	177,881,000	265,115,000
Sales	(85,837,000)	(241,028,000)	(155,409,000)
Charge-offs	(18,534,000)	(27,731,000)	(23,164,000)
Other changes	1,282,000	5,613,000	5,434,000
Ending balance	28,597,000	98,187,000	183,452,000
Allowance, OREO [Roll Forward]
Beginning balance	16,277,000	21,799,000	8,204,000
Provisions	5,812,000	22,209,000	36,759,000
Charge-offs	(18,534,000)	(27,731,000)	(23,164,000)
Ending balance	3,555,000	16,277,000	21,799,000
Other real estate owned, net (OREO)	$ 25,042,000	$ 81,910,000	$ 161,653,000