LOANS - Activity in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			$ 8,552	$ 7,869
Charge-offs		$ (328)	(66)	(328)
Recoveries		1		11
Provision (credit) for loan losses	$ 1,000		2,400	300
Ending balance	10,886	7,852	10,886	7,852
Residential Real Estate [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			4,155	5,103
Charge-offs		(267)		(267)
Provision (credit) for loan losses	(168)	(209)	(923)	(461)
Ending balance	3,232	4,375	3,232	4,375
Multi-family
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			2,433	1,506
Charge-offs		(32)	(66)	(32)
Provision (credit) for loan losses	503	(23)	763	426
Ending balance	3,130	1,900	3,130	1,900
Commercial Real Estate [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			1,884	1,221
Charge-offs		(29)		(29)
Provision (credit) for loan losses	479	228	1,922	317
Ending balance	3,806	1,509	3,806	1,509
Commercial and Industrial [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			79	38
Recoveries		1		11
Provision (credit) for loan losses	103	4	556	18
Ending balance	635	67	635	67
Construction [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			0
Provision (credit) for loan losses	82		82
Ending balance	82		82
Consumer [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Beginning balance			1	1
Provision (credit) for loan losses	1
Ending balance	$ 1	$ 1	$ 1	$ 1

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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