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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Classes of the Loan Portfolio Summarized by Aging Categories) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 595,036	$ 600,512
Total Past Due	11,994	10,747
Non - Accrual	10,041	9,732
Total loans receivable	607,030	611,259
One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	207,027	209,455
Total Past Due	1,377	905
Non - Accrual	944	905
Total loans receivable	208,404	210,360
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	255,777	245,029
Total Past Due	4,519	3,105
Non - Accrual	3,122	2,219
Total loans receivable	260,296	248,134
Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	18,861	23,101
Total Past Due	4,580	5,141
Non - Accrual	4,580	5,141
Total loans receivable	23,441	28,242
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	19,837	19,373
Total Past Due
Non - Accrual
Total loans receivable	19,837	19,373
Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	89,697	99,397
Total Past Due	1,518	1,596
Non - Accrual	1,395	1,467
Total loans receivable	91,215	100,993
Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	3,837	4,157
Total Past Due	3,837
Non - Accrual
Total loans receivable	3,837	4,157
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,433
30-59 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	433
30-59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,000
30-59 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
30-59 Days Past Due [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
30-59 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
30-59 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	520	1,015
60-89 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
60-89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	397	886
60-89 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
60-89 Days Past Due [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
60-89 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	123	129
60-89 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	10,041	9,732
90 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	944	905
90 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	3,122	2,219
90 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	4,580	5,141
90 Days Past Due [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
90 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,395	1,467
90 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due

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