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INVESTMENT SECURITIES - Schedule of Maturities Debt Securities and Mortgage-Backed Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Debt securities: |  |
Amortized Cost, Due within 1 year |  |
Fair Value, Due within 1 year |  |
Amortized Cost, Due after 1 but within 5 years |  |
Fair Value, Due after 1 but within 5 years |  |
Amortized Cost, Due after 5 but within 10 years | 6,500 |
Fair Value, Due after 5 but within 10 years | 6,646 |
Amortized Cost, Due after 10 years |  |
Fair Value, Due after 10 years |  |
Amortized Cost, Total debt securities | 6,500 |
Fair Value, Total debt securities | 6,646 |
Mortgage-backed securities: |  |
Amortized Cost, Mortgage-backed securities | 16,094 |
Fair Value, Mortgage-backed securities | 14,958 |
Amortized Cost, Total securities available-for-sale | 22,594 |
Fair Value, Total securities available-for-sale | 21,604 | $ 15,616
Residential [Member] |  |
Mortgage-backed securities: |  |
Amortized Cost, Mortgage-backed securities | 16,094 |
Fair Value, Mortgage-backed securities | 14,958 |
Commercial [Member] |  |
Mortgage-backed securities: |  |
Amortized Cost, Mortgage-backed securities |  |
Fair Value, Mortgage-backed securities |  |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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