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INVESTMENT SECURITIES - Schedule of Maturities Debt Securities and Mortgage Backed Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Debt securities: |  |
Amortized Cost, Due within 1 year | $ 5,000 |
Fair Value, Due within 1 year | 4,955 |
Amortized Cost, Due after 1 but within 5 years | 14,477 |
Fair Value, Due after 1 but within 5 years | 13,547 |
Amortized Cost, Due after 5 but within 10 years | 1,462 |
Fair Value, Due after 5 but within 10 years | 1,194 |
Amortized Cost, Due after 10 years |  |
Fair Value, Due after 10 years |  |
Amortized Cost, Total debt securities | 20,939 |
Fair Value, Total debt securities | 19,696 |
Mortgage backed securities: |  |
Amortized Cost, Mortgage backed securities | 53,699 |
Fair Value, Mortgage backed securities | 47,425 |
Amortized Cost, Total securities held-to-maturity | 74,638 |
Fair Value, Total securities held-to-maturity | 67,121 | $ 72,617
Residential [Member] |  |
Mortgage backed securities: |  |
Amortized Cost, Mortgage backed securities | 49,648 |
Fair Value, Mortgage backed securities | 43,370 |
Commercial [Member] |  |
Mortgage backed securities: |  |
Amortized Cost, Mortgage backed securities | 4,051 |
Fair Value, Mortgage backed securities | $ 4,055 |

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