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Fair Value Measurements Fair Value Measured on Nonrecurring Basis (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis $ 0 $ 0
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 0
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 415,096 415,096
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 415,096 415,096
Impaired loans [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 [1] 0 [1]
Impaired loans [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 [1] 0 [1]
Impaired loans [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 179,626 [1] 179,626 [1]
Impaired loans [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 179,626 [1] 179,626 [1]
Covered Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 [2] 0 [2]
Covered Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 [2] 0 [2]
Covered Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 39,540 [2] 39,540 [2]
Covered Real Estate Owned [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 39,540 [2] 39,540 [2]
Real estate held for sale [Member] | Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 [2] 0 [2]
Real estate held for sale [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 0 [2] 0 [2]
Real estate held for sale [Member] | Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 195,930 [2] 195,930 [2]
Real estate held for sale [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis 195,930 [2] 195,930 [2]
Change During Period, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale 24,430 123,945
Change During Period, Fair Value Disclosure [Member] | Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale 6,259 [1] 42,550 [1]
Change During Period, Fair Value Disclosure [Member] | Covered Real Estate Owned [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale 295 [2] 2,419 [2]
Change During Period, Fair Value Disclosure [Member] | Real estate held for sale [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale $ 17,876 [2] $ 78,976 [2]
[1] The losses represents remeasurements of collateral-dependent loans.
[2] The losses represents aggregate writedowns and charge-offs on real estate held for sale.