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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	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 602,373	$ 515,546
Total Past Due	10,096	7,455
Non - Accrual	8,904	6,894
Total loans receivable	612,469	523,001
One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	212,510	190,301
Total Past Due	905	114
Non - Accrual	905	114
Total loans receivable	213,415	190,415
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	246,527	229,331
Total Past Due	2,621	3,213
Non - Accrual	1,733	2,652
Total loans receivable	249,148	232,544
Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	18,209	25,551
Total Past Due	5,141	2,900
Non - Accrual	5,141	2,900
Total loans receivable	23,350	28,451
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	20,821	17,832
Total Past Due
Non - Accrual
Total loans receivable	20,821	17,832
Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	99,655	47,541
Total Past Due	1,426	1,228
Non - Accrual	1,125	1,228
Total loans receivable	101,081	48,769
Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	4,651	4,990
Total Past Due	3
Non - Accrual
Total loans receivable	4,654	4,990
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	167	503
30-59 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
30-59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		503
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	167
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	1,025	58
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	888	58
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	134
60-89 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	3
90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	8,904	6,894
90 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	905	114
90 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,733	2,652
90 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	5,141	2,900
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	1,125	1,228
90 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due

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