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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, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | $ 3,537 | $ 3,475 | $ 3,170 | $ 3,056 | $ 3,475 | $ 3,056
Charge-offs | (25) | (297) | (278) | (255) |  |
Recoveries |  | 109 | 18 | 39 |  |
Provision | 257 | 250 | 403 | 330 | 506 | 733
Balance at the end of period | 3,769 | 3,537 | 3,313 | 3,170 | 3,769 | 3,313
One-to four-family residential [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 563 | 587 | 524 | 542 | 587 | 542
Charge-offs | (25) | (127) | (52) | (18) |  |
Recoveries |  | 82 |  | 35 |  |
Provision | (5) | 21 | 175 | (35) |  |
Balance at the end of period | 533 | 563 | 647 | 524 | 533 | 647
Commercial real estate [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 1,299 | 1,277 | 1,152 | 1,075 | 1,277 | 1,075
Charge-offs |  |  |  |  |  |
Recoveries |  | 23 |  |  |  |
Provision | 119 | (1) | (44) | 77 |  |
Balance at the end of period | 1,418 | 1,299 | 1,108 | 1,152 | 1,418 | 1,108
Construction [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 384 | 490 | 368 | 361 | 490 | 361
Charge-offs |  |  |  |  |  |
Recoveries |  | 3 | 3 | 3 |  |
Provision | 58 | (109) | (3) | 4 |  |
Balance at the end of period | 442 | 384 | 368 | 368 | 442 | 368
Home equity lines of credit [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 131 | 57 | 71 | 71 | 57 | 71
Charge-offs |  |  |  |  |  |
Recoveries |  |  | 14 |  |  |
Provision | (19) | 74 | (18) |  |  |
Balance at the end of period | 112 | 131 | 67 | 71 | 112 | 67
Commercial business [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 1,052 | 956 | 914 | 976 | 956 | 976
Charge-offs |  | (170) | (226) | (237) |  |
Recoveries |  | 1 | 1 | 1 |  |
Provision | 106 | 265 | 323 | 174 |  |
Balance at the end of period | 1,158 | 1,052 | 1,012 | 914 | 1,158 | 1,012
Other [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 4 | 6 | 7 | 9 | 6 | 9
Charge-offs |  |  |  |  |  |
Recoveries |  |  |  |  |  |
Provision |  | (2) | 6 | (2) |  |
Balance at the end of period | 4 | 4 | 13 | 7 | 4 | 13
Unallocated [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 104 | 102 | 134 | 22 | 102 | 22
Charge-offs |  |  |  |  |  |
Recoveries |  |  |  |  |  |
Provision | (2) | 2 | (36) | 112 |  |
Balance at the end of period | $ 102 | $ 104 | $ 98 | $ 134 | $ 102 | $ 98

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