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, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	$ 500,504	$ 470,416
Total Past Due	2,154	3,575
Non - Accrual	572	2,358
Total loans receivable	502,658	473,991
One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	180,774	176,546
Total Past Due	250	1,790
Non - Accrual	250	1,663
Total loans receivable	181,024	178,336
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	214,842	206,218
Total Past Due	1,216	900
Non - Accrual	148	482
Total loans receivable	216,058	207,118
Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	29,663	22,622
Total Past Due
Non - Accrual
Total loans receivable	29,663	22,622
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	19,181	18,344
Total Past Due	51	192
Non - Accrual	51
Total loans receivable	19,232	18,536
Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	50,561	40,420
Total Past Due	627	693
Non - Accrual	123	213
Total loans receivable	51,188	41,113
Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	5,483	6,266
Total Past Due	10
Non - Accrual
Total loans receivable	5,493	6,266
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	147	818
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		418
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	147	400
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	1,126	399
60-89 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		127
60-89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	759
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		192
60-89 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	357	80
60-89 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	10
90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	881	2,358
90 Days Past Due [Member] | One-to four-family residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	250	1,663
90 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	457	482
90 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due
90 Days Past Due [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	51
90 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	123	213
90 Days Past Due [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due