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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				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	$ 8,228	$ 8,075	$ 7,130	$ 6,400	$ 8,075	$ 6,400
Charge-offs			(50)
Recoveries	1	53	7	90
Provision (credit)	71	100	467	640	171	1,107
Balance at the end of period		8,228	7,554	7,130		7,554
One-to four-family residential [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1,093	1,136	1,155	1,035	1,136	1,035
Charge-offs
Recoveries	1		1
Provision (credit)	19	(43)	(29)	120
Balance at the end of period	1,113	1,093	1,127	1,155	1,113	1,127
Commercial real estate [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	3,706	3,744	3,408	3,232	3,744	3,232
Charge-offs			(50)
Recoveries		53
Provision (credit)	376	(90)	351	176
Balance at the end of period	4,082	3,706	3,709	3,408	4,082	3,709
Construction [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	724	594	470	672	594	672
Charge-offs
Recoveries
Provision (credit)	79	130	(22)	(202)
Balance at the end of period	803	724	448	470	803	448
Home equity lines of credit [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	232	232	267	179	232	179
Charge-offs
Recoveries
Provision (credit)	(12)		(10)	88
Balance at the end of period	220	232	257	267	220	257
Commercial business [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	2,129	2,046	1,716	1,034	2,046	1,034
Charge-offs
Recoveries			6	90
Provision (credit)	(290)	83	30	592
Balance at the end of period	1,839	2,129	1,752	1,716	1,839	1,752
Other [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1	15	2	1	15	1
Charge-offs
Recoveries
Provision (credit)	1	(14)	(1)	1
Balance at the end of period	2	1	1	2	2	1
Unallocated [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	343	308	112	247	308	247
Charge-offs
Recoveries
Provision (credit)	(102)	35	148	(135)
Balance at the end of period	$ 241	$ 343	$ 260	$ 112	$ 241	$ 260

X

- Definition

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

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