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LOANS RECEIVABLE, NET (Schedule of Impaired Loans by Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Impaired [Line Items]
Recorded Investment With Specific Allowance	$ 2,905
Related Allowance	221
Recorded Investment With No Specific Allowance	11,256	10,354
Total Recorded Investment	14,161	10,354
Total Unpaid Contractual Principal Balance	14,430	10,354
One-to four-family residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance	2,601	1,405
Total Recorded Investment	2,601	1,405
Total Unpaid Contractual Principal Balance	2,601	1,405
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Specific Allowance	599
Related Allowance	46
Recorded Investment With No Specific Allowance	3,806	4,593
Total Recorded Investment	4,405	4,593
Total Unpaid Contractual Principal Balance	4,405	4,593
Home equity lines of credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Specific Allowance	2,306
Related Allowance	175
Recorded Investment With No Specific Allowance	2,835	2,900
Total Recorded Investment	5,141	2,900
Total Unpaid Contractual Principal Balance	5,206	2,900
Commercial business [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance	2,014	1,456
Total Recorded Investment	2,014	1,456
Total Unpaid Contractual Principal Balance	$ 2,218	$ 1,456

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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