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Fair Value Measurements - Fair Value Measured on Nonrecurring Basis (Details) (Fair Value, Measurements, Nonrecurring, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   $ 0
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   190,318
Estiamte of Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   190,318
Impaired loans | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0 [1]
Impaired loans | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0 [1]
Impaired loans | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   87,170 [1]
Impaired loans | Estiamte of Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   87,170 [1]
Covered REO | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0 [2]
Covered REO | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0 [2]
Covered REO | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   20,308 [2]
Covered REO | Estiamte of Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   20,308 [2]
Real estate held for sale | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0 [2]
Real estate held for sale | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   0 [2]
Real estate held for sale | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   82,840 [2]
Real estate held for sale | Estiamte of Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured on nonrecurring basis   82,840 [2]
Changes Measurement
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale 5,192 38,450
Changes Measurement | Impaired loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale 366 [1] 13,371 [1]
Changes Measurement | Covered REO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale 208 [2] 811 [2]
Changes Measurement | Real estate held for sale
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses related to impaired loans and real estate held for sale $ 4,618 [2] $ 24,268 [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.