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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, 2019	Sep. 30, 2018
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 523,987	$ 511,323
Total Past Due	6,837	1,175
Non - Accrual	4,110	906
Total loans receivable	530,824	512,498
One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	191,210	185,132
Total Past Due	38	155
Non - Accrual	38	138
Total loans receivable	191,248	185,287
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	231,116	218,892
Total Past Due	3,321	455
Non - Accrual	920	455
Total loans receivable	234,437	219,347
Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	27,636	30,412
Total Past Due	2,900
Non - Accrual	2,900
Total loans receivable	30,536	30,412
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	18,317	17,892
Total Past Due	29	90
Non - Accrual		90
Total loans receivable	18,346	17,982
Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	51,079	52,845
Total Past Due	549	475
Non - Accrual	252	223
Total loans receivable	51,628	53,320
Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	4,629	6,150
Total Past Due
Non - Accrual
Total loans receivable	4,629	6,150
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,979	269
30-59 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		17
30-59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,682
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	297	252
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	748
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	719
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	29
60-89 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
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	4,110	906
90 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	38	138
90 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	920	455
90 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	2,900
90 Days Past Due [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		90
90 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	252	223
90 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due

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