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LOANS RECEIVABLE, NET (Schedule of Activity in the Allowance for Loan Losses by Loan Category) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period $ 4,200 $ 3,475
Charge-offs (101) (386)
Recoveries 121 114
Provision (credit) 668 997
Balance at the end of period 4,888 4,200
One-to four-family residential [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 687 587
Charge-offs (213)
Recoveries 120 87
Provision (credit) (76) 226
Balance at the end of period 731 687
Commercial real estate [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 1,540 1,277
Charge-offs (1)
Recoveries 23
Provision (credit) 527 240
Balance at the end of period 2,066 1,540
Construction [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 493 490
Charge-offs
Recoveries 3
Provision (credit) 18
Balance at the end of period 511 493
Home equity lines of credit [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 109 57
Charge-offs
Recoveries 1
Provision (credit) 28 52
Balance at the end of period 138 109
Commercial business [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 1,151 956
Charge-offs (100) (170)
Recoveries 1
Provision (credit) 133 364
Balance at the end of period 1,184 1,151
Other [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 25 6
Charge-offs (3)
Recoveries
Provision (credit) (17) 22
Balance at the end of period 8 25
Unallocated [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 195 102
Charge-offs
Recoveries
Provision (credit) 55 93
Balance at the end of period $ 250 $ 195