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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Vintage Analysis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Term Loans by Fiscal Year of Origination
Current period gross write-offs	$ 2	$ 1	$ 5	$ 22
Commercial - Secured
Term Loans by Fiscal Year of Origination
2026	792		792
2025	458		458
2024	430		430
2023	289		289
2022	52		52
Prior	719		719
Total	2,740		2,740
Commercial - Secured \| Pass
Term Loans by Fiscal Year of Origination
2026	792		792
2025	458		458
2024	430		430
2023	289		289
2022	52		52
Prior	719		719
Total	2,740		2,740
Commercial - Unsecured
Term Loans by Fiscal Year of Origination
Prior	11		11
Total	11		11
Commercial - Unsecured \| Pass
Term Loans by Fiscal Year of Origination
Prior	11		11
Total	11		11
Consumer
Term Loans by Fiscal Year of Origination
Current period gross write-offs			5
Real Estate Residential \| Real Estate Residential
Term Loans by Fiscal Year of Origination
2026	11,195		11,195
2025	16,557		16,557
2024	8,746		8,746
2023	9,100		9,100
2022	13,563		13,563
Prior	57,411		57,411
Revolving	2,569		2,569
Total	119,141		119,141
Real Estate Residential \| Real Estate Residential \| Pass
Term Loans by Fiscal Year of Origination
2026	11,195		11,195
2025	16,557		16,557
2024	8,746		8,746
2023	9,100		9,100
2022	13,563		13,563
Prior	57,411		57,411
Revolving	2,569		2,569
Total	119,141		119,141
Real Estate Commercial \| Real Estate Residential
Term Loans by Fiscal Year of Origination
2026	1,016		1,016
2025	1,507		1,507
2024	662		662
2023	2,204		2,204
2022	240		240
Prior	5,452		5,452
Total	11,081		11,081
Real Estate Commercial \| Real Estate Residential \| Pass
Term Loans by Fiscal Year of Origination
2026	1,016		1,016
2025	1,507		1,507
2024	662		662
2023	1,695		1,695
2022	240		240
Prior	5,222		5,222
Total	10,342		10,342
Real Estate Commercial \| Real Estate Residential \| Substandard
Term Loans by Fiscal Year of Origination
2023	509		509
Prior	161		161
Total	670		670
Real Estate Commercial \| Real Estate Residential \| Doubtful
Term Loans by Fiscal Year of Origination
Prior	69		69
Total	69		69
Consumer
Term Loans by Fiscal Year of Origination
Current period gross write-offs	2	$ 1	5	$ 22
Consumer \| Consumer
Term Loans by Fiscal Year of Origination
2026	702		702
2025	635		635
2024	666		666
2023	777		777
2022	264		264
Prior	546		546
Total	3,590		3,590
Consumer \| Consumer \| Pass
Term Loans by Fiscal Year of Origination
2026	702		702
2025	635		635
2024	666		666
2023	777		777
2022	264		264
Prior	546		546
Total	$ 3,590		$ 3,590