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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, 2022 | Sep. 30, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual percent of total loans | 0.22% | 0.23%
Financial Asset Originated |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 33,639 | $ 31,749
Non-accrual loans with no related ACL | 1,215 | 30
90 days or more past due and accruing | 9,996 | 0
Financial Asset Originated | Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 13,884 | 11,723
Non-accrual loans with no related ACL | 1,215 | 30
90 days or more past due and accruing | 9,996 | 0
Financial Asset Originated | Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 0 | 475
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 | 6,412 | 8,038
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 | 4,789 | 365
Non-accrual loans with no related ACL | 1,215 | 30
90 days or more past due and accruing | 9,996 | 0
Financial Asset Originated | Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 343 | 505
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 | 2,340 | 2,340
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 | 19,755 | 20,026
Non-accrual loans with no related 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 | 465 | 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 | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 18,612 | 19,320
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 | 310 | 359
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 | 329 | 287
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 | 39 | 60
Non-accrual loans with no related ACL | 0 | 0
90 days or more past due and accruing | $ 0 | $ 0

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