LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Components of Loans receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Components of loans receivable
Total Loans	$ 126,194
Total Loans		$ 126,605
Net Deferred Loan Costs	426
Net Deferred Loan Costs		437
Net Discounts on Acquired Loans	(948)
Net Discounts on Acquired Loans	(948)	(992)
Allowance for Credit Losses	(1,061)	(623)
Allowance for Loan Losses		(623)	$ (634)	$ (621)
Loans receivable, net		125,427
Loans receivable, net	124,611
Originated
Components of loans receivable
Total Loans	94,719
Total Loans		93,439
Net Deferred Loan Costs	426
Net Deferred Loan Costs		437
Allowance for Credit Losses	(1,061)
Allowance for Loan Losses		(623)
Loans receivable, net		93,253
Loans receivable, net	94,084
Acquired
Components of loans receivable
Total Loans	31,475
Total Loans		33,166
Net Discounts on Acquired Loans	(948)
Net Discounts on Acquired Loans		(992)
Loans receivable, net		32,174
Loans receivable, net	30,527
Residential
Components of loans receivable
Total Loans	104,077
Total Loans		102,251
Residential | Originated
Components of loans receivable
Total Loans	77,125
Total Loans		74,918
Residential | Acquired
Components of loans receivable
Total Loans	26,952
Total Loans		27,333
Commercial
Components of loans receivable
Total Loans	11,228
Total Loans		11,490
Allowance for Credit Losses	(157)	(55)
Allowance for Loan Losses			$ (55)	$ (55)
Commercial | Originated
Components of loans receivable
Total Loans	8,024
Total Loans		7,647
Commercial | Acquired
Components of loans receivable
Total Loans	3,204
Total Loans		3,843
Construction
Components of loans receivable
Total Loans	1,664
Total Loans		2,265
Construction | Originated
Components of loans receivable
Total Loans	1,664
Total Loans		2,265
Home equity loans and lines of credit
Components of loans receivable
Total Loans	1,719
Total Loans		2,963
Home equity loans and lines of credit | Originated
Components of loans receivable
Total Loans	1,719
Total Loans		2,552
Home equity loans and lines of credit | Acquired
Components of loans receivable
Total Loans		411
Commercial Non-Mortgage
Components of loans receivable
Total Loans	1,343
Total Loans		1,501
Commercial Non-Mortgage | Originated
Components of loans receivable
Total Loans	1,059
Total Loans		1,046
Commercial Non-Mortgage | Acquired
Components of loans receivable
Total Loans	284
Total Loans		455
Automobile
Components of loans receivable
Total Loans	3,143
Total Loans		3,027
Automobile | Originated
Components of loans receivable
Total Loans	2,934
Total Loans		2,793
Automobile | Acquired
Components of loans receivable
Total Loans	209
Total Loans		234
Passbook
Components of loans receivable
Total Loans	423
Total Loans		267
Passbook | Originated
Components of loans receivable
Total Loans	204
Total Loans		43
Passbook | Acquired
Components of loans receivable
Total Loans	219
Total Loans		224
Other consumer
Components of loans receivable
Total Loans	2,597
Total Loans		2,841
Other consumer | Originated
Components of loans receivable
Total Loans	1,990
Total Loans		2,175
Other consumer | Acquired
Components of loans receivable
Total Loans	$ 607
Total Loans		$ 666