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Investment Securities: Narrative (Details) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) security | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Realized loss on marketable security | $ 2,000 | $ 0 |  |  |  |
Held-to-maturity securities, realized loss, number of securities | security | 13 |  |  |  |  |
Security owned and pledged as collateral | $ 202,440,000 |  |  | $ 208,810,000 |  |
Allowance for credit losses | 50,000 | 85,000 | $ 55,000 | 60,000 | $ 82,000 | $ 0
Accrued interest on held-to-maturity securites | 635,000 |  |  |  |  |
Private label residential |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for credit losses | 48,000 | $ 77,000 | $ 52,000 | $ 55,000 | $ 73,000 | $ 0
Held-to-maturity securities in non-accrual status | $ 41,000 |  |  |  |  |

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- Definition Amount, before allowance for credit loss, of accrued interest 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 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + 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 Amount excluding accrued interest, of investment in debt security measured at amortized cost (held-to-maturity) on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + 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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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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