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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Activity in the Allowance for Loan Losses by Loan Category) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period $ 4,888 $ 4,200
Charge-offs
Recoveries 2 1
Provision 210 201
Balance at the end of period 5,100 4,402
One-to four-family residential [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 731 687
Charge-offs
Recoveries 2
Provision (26) 11
Balance at the end of period 707 698
Commercial real estate [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 2,066 1,540
Charge-offs
Recoveries
Provision (147) 50
Balance at the end of period 1,919 1,590
Construction [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 511 493
Charge-offs
Recoveries
Provision 63 181
Balance at the end of period 574 674
Home equity lines of credit [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 138 109
Charge-offs
Recoveries 1
Provision 2 11
Balance at the end of period 140 121
Commercial business [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 1,184 1,151
Charge-offs
Recoveries
Provision 311 31
Balance at the end of period 1,495 1,182
Other [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 8 25
Charge-offs
Recoveries
Provision (6) (21)
Balance at the end of period 2 4
Unallocated [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 250 195
Charge-offs
Recoveries
Provision 13 (62)
Balance at the end of period $ 263 $ 133