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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Classes of the Loan Portfolio Summarized by Bank's Internal Risk Rating System) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | $ 612,469 | $ 523,001
Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 602,547 | 514,008
Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 624 | 1,409
Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 9,298 | 7,584
Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
One-to four-family residential [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 213,415 | 190,415
One-to four-family residential [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 212,150 | 189,938
One-to four-family residential [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
One-to four-family residential [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 1,265 | 477
One-to four-family residential [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Commercial real estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 249,148 | 232,544
Commercial real estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 246,804 | 228,156
Commercial real estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 611 | 1,409
Commercial real estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 1,733 | 2,979
Commercial real estate [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Construction [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 23,350 | 28,451
Construction [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 18,209 | 25,551
Construction [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Construction [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 5,141 | 2,900
Construction [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Home equity lines of credit [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 20,821 | 17,832
Home equity lines of credit [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 20,821 | 17,832
Home equity lines of credit [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Home equity lines of credit [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Home equity lines of credit [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Commercial business [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 101,081 | 48,769
Commercial business [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 99,909 | 47,541
Commercial business [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 13 |
Commercial business [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 1,159 | 1,228
Commercial business [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Other [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 4,654 | 4,990
Other [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross | 4,654 | 4,990
Other [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Other [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |
Other [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and Leases Receivable, Gross |  |

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