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INVESTMENT SECURITIES - Schedule of Maturities Debt Securities and Mortgage-Backed Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Debt securities: |  |
Amortized Cost, Due within 1 year | $ 3,000 |
Fair Value, Due within 1 year | 2,994 |
Amortized Cost, Due after 1 but within 5 years | 12,474 |
Fair Value, Due after 1 but within 5 years | 11,683 |
Amortized Cost, Due after 5 but within 10 years | 1,461 |
Fair Value, Due after 5 but within 10 years | 1,225 |
Amortized Cost, Due after 10 years |  |
Fair Value, Due after 10 years |  |
Amortized Cost, Total debt securities | 16,935 |
Fair Value, Total debt securities | 15,902 |
Mortgage backed securities: |  |
Amortized Cost, Mortgage backed securities | 52,585 |
Fair Value, Mortgage backed securities | 46,689 |
Amortized Cost, Total securities held-to-maturity | 69,520 |
Fair Value, Total securities held-to-maturity | 62,591 | $ 72,617
Residential [Member] |  |
Mortgage backed securities: |  |
Amortized Cost, Mortgage backed securities | 48,561 |
Fair Value, Mortgage backed securities | 42,653 |
Commercial [Member] |  |
Mortgage backed securities: |  |
Amortized Cost, Mortgage backed securities | 4,024 |
Fair Value, Mortgage backed securities | $ 4,036 |

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