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Fair Value Measurements - Fair Value Measured on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | $ 42,666 |  | $ 88,183 |  | $ 42,666 |  | $ 88,183 |
Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 0 |  | 0 |  | 0 |  | 0 |
Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 0 |  | 0 |  | 0 |  | 0 |
Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 42,666 |  | 88,183 |  | 42,666 |  | 88,183 |
Impaired loans |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 17,476 | [1] | 6,735 | [2] | 17,476 | [1] | 6,735 | [2]
Impaired loans | Level 1 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans | Level 2 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans | Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 17,476 |  | 6,735 |  | 17,476 |  | 6,735 |
Real estate held for sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets measured on nonrecurring basis | 25,190 | [3] | 81,448 | [4] | 25,190 | [3] | 81,448 | [4]
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 |  | 0 |  | 0 |  | 0 |
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 |  | 0 |  | 0 |  | 0 |
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 | 25,190 |  | 81,448 |  | 25,190 |  | 81,448 |
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 | (1,477) |  | (694) |  | (8,183) |  | 3,508 |
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 | (474) |  | (40) |  | (4,236) |  | (4,241) |
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 | $ (1,003) |  | $ (654) |  | $ (3,947) |  | $ 7,749 |
[1] | The gains (losses) represent remeasurements of collateral-dependent impaired loans.
[2] | The gains (losses) represent remeasurements of collateral-dependent impaired loans.
[3] | The gains (losses) represent aggregate writedowns and charge-offs on real estate owned.
[4] | The gains (losses) represent aggregate writedowns and charge-offs on real estate owned.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Fair value adjustments to collateral dependent loans and real estate held for sale are recorded to reflect write-downs of principal balances based on the current appraised or estimated value of the collateral. + References No definition available. + Details
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