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SECURITIES - Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 28,068	$ 29,308
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(4,107)	(3,655)
Fair Value	23,961	25,653
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	23,961	25,653
OVER 12 MONTHS, Gross Unrealized (Losses)	(4,107)	(3,655)
TOTAL, Fair Value	23,961	25,653
TOTAL, Gross Unrealized (Losses)	(4,107)	(3,655)
Amortized Cost
Due after ten years	26,264	27,373
Total	26,264	27,373
Mortgage-backed securities	1,804	1,935
Fair Value
Due after ten years	22,358	23,943
Total	22,358	23,943
Mortgage-backed securities	1,603	1,710
Non-bank qualified obligations of states and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	26,264	27,373
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(3,906)	(3,430)
Fair Value	22,358	23,943
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	22,358	23,943
OVER 12 MONTHS, Gross Unrealized (Losses)	(3,906)	(3,430)
TOTAL, Fair Value	22,358	23,943
TOTAL, Gross Unrealized (Losses)	(3,906)	(3,430)
Mortgage-backed securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,804	1,935
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(201)	(225)
Fair Value	1,603	1,710
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
LESS THAN 12 MONTHS, Fair Value	0	0
LESS THAN 12 MONTHS, Gross Unrealized (Losses)	0	0
OVER 12 MONTHS, Fair Value	1,603	1,710
OVER 12 MONTHS, Gross Unrealized (Losses)	(201)	(225)
TOTAL, Fair Value	1,603	1,710
TOTAL, Gross Unrealized (Losses)	$ (201)	$ (225)

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