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Loans Receivable - Additional Information (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) loan | Sep. 30, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accrued interest receivables for loans | $ 47,106 | $ 46,234
Loans pledged to secure borrowings from the Federal Home Loan Bank | 7,175,190 | $ 5,930,015
Nonaccrual interest income recognized | 1,250 |
Impaired, interest income on accrual accrual and performed loans | $ 328 |
Basis point reduction, minimum | 1.00% |
Basis point reduction, maximum | 2.00% |
Percent of TDRs classified as performing | 97.40% |
Single family residential loans as percentage of restructured loans | 92.20% |
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 | $ 60,326 |
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans modified | loan | 1 |
Total loans modified | $ 475 |
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans modified | loan | 16 |
Total loans modified | $ 3,526 |

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