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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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans			$ 7,800	$ 6,900
One-to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	$ 1,240	$ 2,531	1,204	2,728
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	3,923	3,658	3,936	3,801
Construction [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	2,900		1,933
Home equity lines of credit [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	49		52
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	646	363	667	323
Other [Member]
Financing Receivable, Impaired [Line Items]
Average investment in impaired loans	$ 8,758	$ 6,552	$ 7,792	$ 6,852

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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=118936363&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524

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