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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual interest income recognized |  |  | $ 2,663 |
Impaired, interest lost on nonaccrual loans |  |  | $ 1,624 |
Percent of TDRs classified as performing |  |  | 96.30% |
Troubled debt restructuring, amount | $ 619 | $ 789 | $ 982 | $ 12,240
Basis point reduction, minimum |  |  | 1.00% |
Basis point reduction, maximum |  |  | 2.00% |
Single family residential loans as percentage of restructured loans | 91.50% |  | 91.50% |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Term for payment and rate reduction |  |  | 6 months |
Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Term for payment and rate reduction |  |  | 24 months |
Performing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructuring, amount |  |  | $ 128,858 |

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