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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, 2021
Dec. 31, 2020
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period $ 8,075 $ 6,400
Charge-offs
Recoveries 52 90
Provision (credit) 101 640
Balance at the end of period 8,228 7,130
One-to four-family residential [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 1,136 1,035
Charge-offs
Recoveries
Provision (credit) (43) 120
Balance at the end of period 1,093 1,155
Commercial real estate [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 3,744 3,232
Charge-offs
Recoveries 52
Provision (credit) (90) 176
Balance at the end of period 3,706 3,408
Construction [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 594 672
Charge-offs
Recoveries
Provision (credit) 130 (202)
Balance at the end of period 724 470
Home equity lines of credit [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 232 179
Charge-offs
Recoveries
Provision (credit) 88
Balance at the end of period 232 267
Commercial business [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 2,046 1,034
Charge-offs
Recoveries 90
Provision (credit) 83 592
Balance at the end of period 2,129 1,716
Other [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 15 1
Charge-offs
Recoveries
Provision (credit) (14) 1
Balance at the end of period 1 2
Unallocated [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 308 247
Charge-offs
Recoveries
Provision (credit) 35 (135)
Balance at the end of period $ 343 $ 112