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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Impaired Loans by Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance	9,076	5,861
Total Impaired Loans Recorded Investment	9,076	5,861
Total Impaired Loans Unpaid Principal Balance	9,076	5,952
One-to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance	1,339	1,132
Total Impaired Loans Recorded Investment	1,339	1,132
Total Impaired Loans Unpaid Principal Balance	1,339	1,132
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance	4,355	3,961
Total Impaired Loans Recorded Investment	4,355	3,961
Total Impaired Loans Unpaid Principal Balance	4,355	3,961
Home equity lines of credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance	2,900	58
Total Impaired Loans Recorded Investment	2,900	58
Total Impaired Loans Unpaid Principal Balance	2,900	58
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance	482	710
Total Impaired Loans Recorded Investment	482	710
Total Impaired Loans Unpaid Principal Balance	$ 482	$ 801

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
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-Topic 310
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-Section 50
-Paragraph 14A
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