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LOANS RECEIVABLE, NET (Schedule of Impaired Loans by Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance 10,354 5,861
Total Recorded Investment 10,354 5,861
Total Unpaid Contractual Principal Balance 10,354 5,952
One-to four-family residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance 1,405 1,132
Total Recorded Investment 1,405 1,132
Total Unpaid Contractual Principal Balance 1,405 1,132
Commercial real estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance 4,593 3,961
Total Recorded Investment 4,593 3,961
Total Unpaid Contractual Principal Balance 4,593 3,961
Home equity lines of credit [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance 2,900 58
Total Recorded Investment 2,900 58
Total Unpaid Contractual Principal Balance 2,900 58
Commercial business [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With Specific Allowance
Related Allowance
Recorded Investment With No Specific Allowance 1,456 710
Total Recorded Investment 1,456 710
Total Unpaid Contractual Principal Balance $ 1,456 $ 801