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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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