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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 47,287	$ 56,669
Gross Unrealized Gains	0	193
Gross Unrealized (Losses)	(1,851)	(471)
Fair Value	45,436	56,391
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
LESS THAN 12 MONTHS, Fair Value	45,437	26,096
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(1,851)	(471)
OVER 12 MONTHS, Fair Value	0	0
OVER 12 MONTHS, Gross Unrealized (Losses)	0	0
TOTAL, Fair Value	45,437	26,096
TOTAL, Gross Unrealized (Losses)	(1,851)	(471)
Amortized Cost
Due after ten years	44,369	52,944
Total	44,369	52,944
Mortgage-backed securities	2,918	3,725
Fair Value
Due after ten years	42,601	52,576
Total	42,601	52,576
Mortgage-backed securities	2,835	3,815
Non-bank qualified obligations of states and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	44,369	52,944
Gross Unrealized Gains	0	103
Gross Unrealized (Losses)	(1,768)	(471)
Fair Value	42,601	52,576
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
LESS THAN 12 MONTHS, Fair Value	42,602	26,096
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(1,768)	(471)
OVER 12 MONTHS, Fair Value	0	0
OVER 12 MONTHS, Gross Unrealized (Losses)	0	0
TOTAL, Fair Value	42,602	26,096
TOTAL, Gross Unrealized (Losses)	(1,768)	(471)
Mortgage-backed securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	2,918	3,725
Gross Unrealized Gains	0	90
Gross Unrealized (Losses)	(83)	0
Fair Value	2,835	$ 3,815
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
LESS THAN 12 MONTHS, Fair Value	2,835
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	(83)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Gross Unrealized (Losses)	0
TOTAL, Fair Value	2,835
TOTAL, Gross Unrealized (Losses)	$ (83)

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