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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, 2025 | Sep. 30, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.28% | 0.33%
Financial Asset Originated |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual | $ 59,886 | $ 69,541
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 1,083
Financial Asset Originated | Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual | 39,797 | 46,299
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 1,083
Financial Asset Originated | Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual | 10,477 | 18,743
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 | 29,320 | 26,362
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 | 0 | 0
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | 0 | 1,083
Financial Asset Originated | Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual | 0 | 1,120
Non-accrual with no ACL | 0 | 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 | 0 | 74
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 | 20,089 | 23,242
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 | 847 | 848
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 | 18,734 | 21,488
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 | 8 | 0
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 | 300 | 596
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 | 200 | 310
Non-accrual with no ACL | 0 | 0
90 days or more past due and accruing | $ 0 | $ 0

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