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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Financing receivables that are current.

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-Name Accounting Standards Codification



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-SubTopic 10



-Section 50



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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual Interest Income Recognized

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