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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Activity in the Allowance for Loan Losses by Loan Category) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	Jun. 30, 2021
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	$ 8,300	$ 8,228	$ 8,075	$ 7,554	$ 7,130	$ 6,400	$ 8,075	$ 6,400
Charge-offs					(50)
Recoveries		1	52		7	90
Provision (credit)	205	71	101	246	467	640	376	1,353
Balance at the end of period	8,505	8,300	8,228	7,800	7,554	7,130	8,505	7,800
One-to four-family residential [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1,113	1,093	1,136	1,127	1,155	1,035	1,136	1,035
Charge-offs
Recoveries		1			1
Provision (credit)	35	19	(43)	(39)	(29)	120
Balance at the end of period	1,148	1,113	1,093	1,088	1,127	1,155	1,148	1,088
Commercial real estate [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	4,082	3,706	3,744	3,709	3,408	3,232	3,744	3,232
Charge-offs					(50)
Recoveries			52
Provision (credit)	334	376	(90)	(3)	351	176
Balance at the end of period	4,416	4,082	3,706	3,706	3,709	3,408	4,416	3,706
Construction [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	803	724	594	448	470	672	594	672
Charge-offs
Recoveries
Provision (credit)	(196)	79	130	179	(22)	(202)
Balance at the end of period	607	803	724	627	448	470	607	627
Home equity lines of credit [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	220	232	232	257	267	179	232	179
Charge-offs
Recoveries
Provision (credit)	5	(12)		9	(10)	88
Balance at the end of period	225	220	232	266	257	267	225	266
Commercial business [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1,839	2,129	2,046	1,752	1,716	1,034	2,046	1,034
Charge-offs
Recoveries					6	90
Provision (credit)	(62)	(290)	83	149	30	592
Balance at the end of period	1,777	1,839	2,129	1,901	1,752	1,716	1,777	1,901
Other [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	2	1	15	1	2	1	15	1
Charge-offs
Recoveries
Provision (credit)	(1)	1	(14)	(1)	(1)	1
Balance at the end of period	1	2	1		1	2	1
Unallocated [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	241	343	308	260	112	247	308	247
Charge-offs
Recoveries
Provision (credit)	90	(102)	35	(48)	148	(135)
Balance at the end of period	$ 331	$ 241	$ 343	$ 212	$ 260	$ 112	$ 331	$ 212

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- Definition

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

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