Other Real Estate Owned (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Changes in OREO covered and not covered under a loss-share agreement
Beginning balance, Covered OREO	$ 43,156
Beginning balance, Not Covered OREO	70,079
Beginning balance, Total OREO	113,235
Transfers of loans, Covered OREO	27,056
Transfers of loans, Not Covered OREO	7,161
Transfers of loans, Total OREO	34,217
Capitalized improvements, Covered OREO
Capitalized improvements, Not Covered OREO	508
Capitalized improvements, Total OREO	508
Impairments, Covered OREO	(7,507)
Impairments, Not Covered OREO	(3,689)
Impairments, Total OREO	(11,196)
Dispositions, Covered OREO	(21,076)
Dispositions, Not Covered OREO	(25,674)
Dispositions, Total OREO	(46,750)
Other, Covered OREO	(14)
Other, Not Covered OREO	183
Other, Total OREO	169
Ending balance, Covered OREO	41,615
Ending balance, Not Covered OREO	48,568
Ending balance, Total OREO	$ 90,183