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Loans Receivable - Non-accrual Loans and Loans 90 Days or More Past Due and Accruing (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.29% | 0.29%
Financial Asset Originated |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 60,806 | $ 50,422
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 39,947 | 34,644
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 8,377 | 5,127
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 27,022 | 23,435
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 4,436 | 6,082
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 0 | 0
Non-accrual with no ACL |  | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 112 | 0
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 20,859 | 15,778
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 88 | 88
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 20,016 | 14,918
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 0 | 9
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 491 | 736
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 0
Financial Asset Originated | Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 264 | 27
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | $ 0 | $ 0

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