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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, 2019	Sep. 30, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 518,126	$ 515,546
Total Past Due	12,322	7,455
Non - Accrual	5,449	6,894
Total loans receivable	530,448	523,001
One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	193,707	190,301
Total Past Due	1,583	114
Non - Accrual	328	114
Total loans receivable	195,290	190,415
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	226,887	229,331
Total Past Due	4,077	3,213
Non - Accrual	1,018	2,652
Total loans receivable	230,964	232,544
Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	24,555	25,551
Total Past Due	5,222	2,900
Non - Accrual	2,900	2,900
Total loans receivable	29,777	28,451
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	19,783	17,832
Total Past Due	93
Non - Accrual
Total loans receivable	19,876	17,832
Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	48,382	47,541
Total Past Due	1,347	1,228
Non - Accrual	1,203	1,228
Total loans receivable	49,729	48,769
Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	4,812	4,990
Total Past Due
Non - Accrual
Total loans receivable	4,812	4,990
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	3,295	503
30-59 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,021
30-59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	2,085	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	93
30-59 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	96
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	3,578	58
60-89 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	234
60-89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	974	58
60-89 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	2,322
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	48
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	5,449	6,894
90 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	328	114
90 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,018	2,652
90 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	2,900	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	1,203	1,228
90 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due

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