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Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | $ 82 |  | $ 0 |
Provision for (Recapture of) Credit Losses | 3 | $ 0 | (7) | $ 0
Ending Allowance | 85 |  | 85 |
Impact of Adopting CECL (ASU 2016-13) |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 0 |  | 92 |
Private label residential |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 73 |  | 0 |
Provision for (Recapture of) Credit Losses | 4 |  | (5) |
Ending Allowance | 77 |  | 77 |
Private label residential | Impact of Adopting CECL (ASU 2016-13) |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 0 |  | 82 |
Bank issued trust preferred securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | 9 |  | 0 |
Provision for (Recapture of) Credit Losses | (1) |  | (2) |
Ending Allowance | 8 |  | 8 |
Bank issued trust preferred securities | Impact of Adopting CECL (ASU 2016-13) |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning Allowance | $ 0 |  | $ 10 |

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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 Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + 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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