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Loans Receivable - Additional Information (Details) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) branch loan | Jun. 30, 2020 USD ($) branch | Sep. 30, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable for loans | $ 43,712 | $ 43,712 | $ 41,429
Loans pledged to secure borrowings from the Federal Home Loan Bank | $ 5,592,355 | 5,592,355 | $ 5,874,704
Nonaccrual interest income recognized |  | 2,513 |
Impaired, interest income on accrual accrual and performed loans |  | $ 1,047 |
Number of businesses assisted, CARES Act | branch | 6,500 | 6,500 |
Percent of TDRs classified as performing |  | 97.00% |
Basis point reduction, minimum |  | 1.00% |
Basis point reduction, maximum |  | 2.00% |
Single family residential loans as percentage of restructured loans | 93.10% | 93.10% |
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 |  | $ 98,056 |
SBA Payroll Protection Program, CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of PPP loans authorized, CARES Act |  | 780,000 |
Consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans modified | loan | 1,192 |  |
Total loans modified | $ 346,000 | 346,000 |
Commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans modified | loan | 196 |  |
Total loans modified | $ 416,000 | $ 416,000 |

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