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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, 2017
Dec. 31, 2016
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period $ 3,475 $ 3,056
Charge-offs (297) (255)
Recoveries 109 39
Provision 250 330
Balance at the end of period 3,537 3,170
One-to four-family residential [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 587 542
Charge-offs (127) (18)
Recoveries 82 35
Provision 21 (35)
Balance at the end of period 563 524
Commercial real estate [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 1,277 1,075
Charge-offs
Recoveries 23
Provision (1) 77
Balance at the end of period 1,299 1,152
Construction [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 490 361
Charge-offs
Recoveries 3 3
Provision (109) 4
Balance at the end of period 384 368
Home equity lines of credit [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 57 71
Charge-offs
Recoveries
Provision 74
Balance at the end of period 131 71
Commercial business [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 956 976
Charge-offs (170) (237)
Recoveries 1 1
Provision 265 174
Balance at the end of period 1,052 914
Other [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 6 9
Charge-offs
Recoveries
Provision (2) (2)
Balance at the end of period 4 7
Unallocated [Member]    
Activity in the allowance for loan losses by loan category:    
Balance at beginning of period 102 22
Charge-offs
Recoveries
Provision 2 112
Balance at the end of period $ 104 $ 134