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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
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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