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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, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	$ 7,554	$ 7,130	$ 6,400	$ 5,525	$ 5,100	$ 4,888	$ 6,400	$ 4,888
Charge-offs		(50)		(65)
Recoveries		7	90	102	5	2
Provision (credit)	246	467	640	438	420	210	1,353	1,069
Balance at the end of period	7,800	7,554	7,130	6,000	5,525	5,100	7,800	6,000
One-to four-family residential [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1,127	1,155	1,035	939	707	731	1,035	731
Charge-offs
Recoveries		1		2	5	2
Provision (credit)	(39)	(29)	120	128	227	(26)
Balance at the end of period	1,088	1,127	1,155	1,069	939	707	1,088	1,069
Commercial real estate [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	3,709	3,408	3,232	2,376	1,919	2,066	3,232	2,066
Charge-offs		(50)
Recoveries
Provision (credit)	(3)	351	176	241	457	(147)
Balance at the end of period	3,706	3,709	3,408	2,617	2,376	1,919	3,706	2,617
Construction [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	448	470	672	644	574	511	672	511
Charge-offs				(65)
Recoveries
Provision (credit)	179	(22)	(202)	108	70	63
Balance at the end of period	627	448	470	687	644	574	627	687
Home equity lines of credit [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	257	267	179	182	140	138	179	138
Charge-offs
Recoveries
Provision (credit)	9	(10)	88		42	2
Balance at the end of period	266	257	267	182	182	140	266	182
Commercial business [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1,752	1,716	1,034	1,208	1,495	1,184	1,034	1,184
Charge-offs
Recoveries		6	90	100
Provision (credit)	149	30	592	(47)	(287)	311
Balance at the end of period	1,901	1,752	1,716	1,261	1,208	1,495	1,901	1,261
Other [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	1	2	1		2	8	1	8
Charge-offs
Recoveries
Provision (credit)	(1)	(1)	1	1	(2)	(6)
Balance at the end of period		1	2	1		2		1
Unallocated [Member]
Activity in the allowance for loan losses by loan category:
Balance at beginning of period	260	112	247	176	263	250	247	250
Charge-offs
Recoveries
Provision (credit)	(48)	148	(135)	7	(87)	13
Balance at the end of period	$ 212	$ 260	$ 112	$ 183	$ 176	$ 263	$ 212	$ 183

X

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

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