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Loans Receivable (excluding Covered Loans) - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans by portfolio segment | $ 5,272 |
Impaired, interest lost on nonaccrual loans | 2,421 |
Recorded investment, less than 90 days past due, classified as substandard | $ 8,731,344 | $ 8,203,280
Basis point reduction, minimum | 100.00% |
Basis point reduction, maximum | 200.00% |
Percentage of restructured loans | 85.70% |
Minimum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term for payment and rate reduction | 6 months |
Maximum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Term for payment and rate reduction | 12 months |
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment, less than 90 days past due, classified as substandard | $ 94,346 |

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