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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 6 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period $ 4,402 $ 4,200 $ 3,537 $ 3,475 $ 4,200 $ 3,475
Charge-offs (25) (297)    
Recoveries 92 1 109    
Provision 106 201 257 250 307 506
Balance at the end of period 4,600 4,402 3,769 3,537 4,600 3,769
One-to four-family residential [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 698 687 563 587 687 587
Charge-offs (25) (127)    
Recoveries 92 82    
Provision (80) 11 (5) 21    
Balance at the end of period 710 698 533 563 710 533
Commercial real estate [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 1,590 1,540 1,299 1,277 1,540 1,277
Charge-offs    
Recoveries 23    
Provision 95 50 119 (1)    
Balance at the end of period 1,685 1,590 1,418 1,299 1,685 1,418
Construction [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 674 493 384 490 493 490
Charge-offs    
Recoveries 3    
Provision 142 181 58 (109)    
Balance at the end of period 816 674 442 384 816 442
Home equity lines of credit [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 121 109 131 57 109 57
Charge-offs    
Recoveries 1    
Provision 17 11 (19) 74    
Balance at the end of period 138 121 112 131 138 112
Commercial business [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 1,182 1,151 1,052 956 1,151 956
Charge-offs (170)    
Recoveries 1    
Provision (78) 31 106 265    
Balance at the end of period 1,104 1,182 1,158 1,052 1,104 1,158
Other [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 4 25 4 6 25 6
Charge-offs    
Recoveries    
Provision (1) (21) (2)    
Balance at the end of period 3 4 4 4 3 4
Unallocated [Member]            
Activity in the allowance for loan losses by loan category:            
Balance at beginning of period 133 195 104 102 195 102
Charge-offs    
Recoveries    
Provision 11 (62) (2) 2    
Balance at the end of period $ 144 $ 133 $ 102 $ 104 $ 144 $ 102