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Loans Receivable - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) portfolioSegment | Sep. 30, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of portfolio segments for loans held for investment | portfolioSegment | 2 |
Accrued interest receivables for loans | $ 67,169 | $ 57,070
Loans pledged to secure borrowings from the Federal Home Loan Bank | 8,636,895 | $ 8,224,951
Nonaccrual interest income recognized | 534 |
Impaired, interest income on accrual accrual and performed loans | $ 358 |
Basis point reduction, minimum | 1.00% |
Basis point reduction, maximum | 2.00% |
Percent of TDRs classified as performing | 98.00% |
Single family residential loans as percentage of restructured loans | 82.50% |
Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled debt restructuring, amount | $ 55,515 |
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 |

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