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Loans Receivable - Non-accrual Loans and Loans 90 Days or More Past Due and Accruing (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.31% | 0.21%
Financial Asset Originated |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 55,276 | $ 34,534
Non-accrual loans with no related ACL | 0 | 1,308
90 days or more past due and accruing | 25 | 0
Financial Asset Originated | Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 38,724 | 16,296
Non-accrual loans with no related ACL | 0 | 1,308
90 days or more past due and accruing | 23 | 0
Financial Asset Originated | Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 5,951 | 5,912
Non-accrual loans with no related 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 | 1,087 | 4,691
Non-accrual loans with no related 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 | 31,686 | 5,693
Non-accrual loans with no related ACL | 0 | 1,308
90 days or more past due and accruing | 23 | 0
Financial Asset Originated | Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 0 | 0
Non-accrual loans with no related 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 loans | 0 | 0
Non-accrual loans with no related 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 | 16,552 | 18,238
Non-accrual loans with no related ACL | 0 | 0
90 days or more past due and accruing | 2 | 0
Financial Asset Originated | Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 87 | 435
Non-accrual loans with no related 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 | 15,510 | 17,450
Non-accrual loans with no related 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 | 122 | 84
Non-accrual loans with no related 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 | 801 | 233
Non-accrual loans with no related 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 | 32 | 36
Non-accrual loans with no related ACL | 0 | 0
90 days or more past due and accruing | $ 2 | $ 0

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