Fair Value Measurement (Details 3) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets measured at fair value on a nonrecurring basis
Mortgage Servicing rights	$ 20,766	$ 21,579
Level 1 [Member] | Nonrecurring [Member]
Assets measured at fair value on a nonrecurring basis
Mortgage Servicing rights	0
Impaired and nonaccrual loans	0
Other property	0
Other real estate covered by loss share	0
Total assets at fair value on a recurring and nonrecurring basis	0
Level 2 [Member] | Nonrecurring [Member]
Assets measured at fair value on a nonrecurring basis
Mortgage Servicing rights	0
Impaired and nonaccrual loans	0
Other property	0
Other real estate covered by loss share	0
Total assets at fair value on a recurring and nonrecurring basis	0
Level 3 [Member] | Nonrecurring [Member]
Assets measured at fair value on a nonrecurring basis
Mortgage Servicing rights	20,766
Impaired and nonaccrual loans	114,975
Other property	33,006
Other real estate covered by loss share	64,372
Total assets at fair value on a recurring and nonrecurring basis	233,119
Nonrecurring [Member]
Assets measured at fair value on a nonrecurring basis
Mortgage Servicing rights	20,766
Impaired and nonaccrual loans	114,975
Other property	33,006
Other real estate covered by loss share	64,372
Total assets at fair value on a recurring and nonrecurring basis	$ 233,119