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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Average Recorded Investment in Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	$ 10,276	$ 8,758	$ 10,302	$ 7,792
One-to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	1,787	1,240	1,659	1,204
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	2,995	3,923	3,528	3,936
Construction [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	4,053	2,900	3,669	1,933
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	$ 1,441	646	$ 1,446	667
Home equity lines of credit [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans		$ 49		$ 52

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Average 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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

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