LOANS - Impaired Loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
With no related allowance recorded [Abstract]
Unpaid principal balance	$ 10,854,000		$ 10,854,000		$ 14,600,000
Recorded investment	10,827,000		10,827,000		14,522,000
With an related allowance recorded [Abstract]
Allowance Allocated	724,000		724,000		0
Impaired Financing Receivable With No Related Allowance Average Recorded Investment And Interest Income Recognized [Abstract]
Average Recorded Investment	11,459,000	$ 12,150,000	12,026,000	$ 8,124,000
Interest Income Recognized		17,000	78,000	50,000
Residential Real Estate
With no related allowance recorded [Abstract]
Unpaid principal balance	3,733,000		3,733,000		5,394,000
Recorded investment	3,731,000		3,731,000		5,392,000
Impaired Financing Receivable With No Related Allowance Average Recorded Investment And Interest Income Recognized [Abstract]
Average Recorded Investment	3,642,000	5,034,000	3,701,000	4,400,000
Interest Income Recognized		17,000	52,000	50,000
Multi-family
With no related allowance recorded [Abstract]
Unpaid principal balance	1,935,000		1,935,000		2,348,000
Recorded investment	1,935,000		1,935,000		2,348,000
With an related allowance recorded [Abstract]
Unpaid Principal Balance	1,564,000		1,564,000
Recorded Investment	1,564,000		1,564,000
Allowance Allocated	724,000		724,000
Impaired Financing Receivable With No Related Allowance Average Recorded Investment And Interest Income Recognized [Abstract]
Average Recorded Investment	2,150,000	1,058,000	2,274,000	641,000
Interest Income Recognized			3,000
Impaired Financing Receivable With Related Allowance Average Recorded Investment And Interest Income Recognized [Abstract]
Average Recorded Investment	521,000		174,000
Commercial Real Estate
With no related allowance recorded [Abstract]
Unpaid principal balance	4,796,000		4,796,000		5,950,000
Recorded investment	4,796,000		4,796,000		5,875,000
Impaired Financing Receivable With No Related Allowance Average Recorded Investment And Interest Income Recognized [Abstract]
Average Recorded Investment	5,269,000	5,851,000	5,633,000	2,883,000
Commercial and industrial
With no related allowance recorded [Abstract]
Unpaid principal balance	390,000		390,000		908,000
Recorded investment	365,000		365,000		$ 907,000
Impaired Financing Receivable With No Related Allowance Average Recorded Investment And Interest Income Recognized [Abstract]
Average Recorded Investment	$ 398,000	$ 207,000	418,000	$ 200,000
Interest Income Recognized			$ 23,000