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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Jun. 30, 2022 | Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivables for loans | $ 49,263 | $ 46,234
Loans pledged to secure borrowings from the Federal Home Loan Bank | 7,841,568 | $ 5,930,015
Nonaccrual interest income recognized | 2,544 |
Impaired, interest income on accrual accrual and performed loans | $ 969 |
Basis point reduction, minimum | 1.00% |
Basis point reduction, maximum | 2.00% |
Percent of TDRs classified as performing | 97.60% |
Single family residential loans as percentage of restructured loans | 82.70% |
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 | $ 58,896 |

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