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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, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | $ 8,228 | $ 8,075 | $ 7,130 | $ 6,400 | $ 8,075 | $ 6,400
Charge-offs |  |  | (50) |  |  |
Recoveries | 1 | 53 | 7 | 90 |  |
Provision (credit) | 71 | 100 | 467 | 640 | 171 | 1,107
Balance at the end of period |  | 8,228 | 7,554 | 7,130 |  | 7,554
One-to four-family residential [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 1,093 | 1,136 | 1,155 | 1,035 | 1,136 | 1,035
Charge-offs |  |  |  |  |  |
Recoveries | 1 |  | 1 |  |  |
Provision (credit) | 19 | (43) | (29) | 120 |  |
Balance at the end of period | 1,113 | 1,093 | 1,127 | 1,155 | 1,113 | 1,127
Commercial real estate [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 3,706 | 3,744 | 3,408 | 3,232 | 3,744 | 3,232
Charge-offs |  |  | (50) |  |  |
Recoveries |  | 53 |  |  |  |
Provision (credit) | 376 | (90) | 351 | 176 |  |
Balance at the end of period | 4,082 | 3,706 | 3,709 | 3,408 | 4,082 | 3,709
Construction [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 724 | 594 | 470 | 672 | 594 | 672
Charge-offs |  |  |  |  |  |
Recoveries |  |  |  |  |  |
Provision (credit) | 79 | 130 | (22) | (202) |  |
Balance at the end of period | 803 | 724 | 448 | 470 | 803 | 448
Home equity lines of credit [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 232 | 232 | 267 | 179 | 232 | 179
Charge-offs |  |  |  |  |  |
Recoveries |  |  |  |  |  |
Provision (credit) | (12) |  | (10) | 88 |  |
Balance at the end of period | 220 | 232 | 257 | 267 | 220 | 257
Commercial business [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 2,129 | 2,046 | 1,716 | 1,034 | 2,046 | 1,034
Charge-offs |  |  |  |  |  |
Recoveries |  |  | 6 | 90 |  |
Provision (credit) | (290) | 83 | 30 | 592 |  |
Balance at the end of period | 1,839 | 2,129 | 1,752 | 1,716 | 1,839 | 1,752
Other [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 1 | 15 | 2 | 1 | 15 | 1
Charge-offs |  |  |  |  |  |
Recoveries |  |  |  |  |  |
Provision (credit) | 1 | (14) | (1) | 1 |  |
Balance at the end of period | 2 | 1 | 1 | 2 | 2 | 1
Unallocated [Member] |  |  |  |  |  |
Activity in the allowance for loan losses by loan category: |  |  |  |  |  |
Balance at beginning of period | 343 | 308 | 112 | 247 | 308 | 247
Charge-offs |  |  |  |  |  |
Recoveries |  |  |  |  |  |
Provision (credit) | (102) | 35 | 148 | (135) |  |
Balance at the end of period | $ 241 | $ 343 | $ 260 | $ 112 | $ 241 | $ 260

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