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Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | $ 55 | $ 82 | $ 60 | $ 0
Provision for (Recapture of) Credit Losses | (5) | 3 | (10) | (7)
Ending Allowance | 50 | 85 | 50 | 85
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance |  |  |  | 92
Private label residential |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 52 | 73 | 55 | 0
Provision for (Recapture of) Credit Losses | (4) | 4 | (7) | (5)
Ending Allowance | 48 | 77 | 48 | 77
Private label residential | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance |  |  |  | 82
Bank issued trust preferred securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 3 | 9 | 5 | 0
Provision for (Recapture of) Credit Losses | (1) | (1) | (3) | (2)
Ending Allowance | $ 2 | $ 8 | $ 2 | 8
Bank issued trust preferred securities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance |  |  |  | $ 10

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- Definition Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Provision for (Recapture of) Credit Losses + References No definition available. + Details
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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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