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CREDIT DISCLSOURES - Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Loans without a specific valuation allowance |  |  |  |  |
Recorded Balance | $ 3,878 |  | $ 3,878 |  | $ 1,181
Unpaid Principal Balance | 3,878 |  | 3,878 |  | 1,181
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Recorded investment | 135 |  | 135 |  |
Unpaid principal balance | 135 |  | 135 |  |
Specific allowance | 25 |  | 25 |  |
Average Recorded Investment | 2,614 | $ 1,866 | 2,020 | $ 1,319 |
1-4 Family Real Estate [Member] |  |  |  |  |
Loans without a specific valuation allowance |  |  |  |  |
Recorded Balance | 95 |  | 95 |  | 72
Unpaid Principal Balance | 95 |  | 95 |  | 72
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Recorded investment | 135 |  | 135 |  |
Unpaid principal balance | 135 |  | 135 |  |
Specific allowance | 25 |  | 25 |  |
Average Recorded Investment | 140 | 210 | 110 | 191 |
Commercial and Multi-Family Real Estate [Member] |  |  |  |  |
Loans without a specific valuation allowance |  |  |  |  |
Recorded Balance | 702 |  | 702 |  | 1,109
Unpaid Principal Balance | 702 |  | 702 |  | $ 1,109
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Average Recorded Investment | 705 | 668 | 840 | 550 |
Agricultural Real Estate [Member] |  |  |  |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Average Recorded Investment | 0 | 194 | 0 | 97 |
Consumer [Member] |  |  |  |  |
Loans without a specific valuation allowance |  |  |  |  |
Recorded Balance | 144 |  | 144 |  |
Unpaid Principal Balance | 144 |  | 144 |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Average Recorded Investment | 89 | 0 | 55 | 0 |
Commercial Operating [Member] |  |  |  |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Average Recorded Investment | 0 | 437 | 0 | 302 |
Agricultural Operating [Member] |  |  |  |  |
Loans without a specific valuation allowance |  |  |  |  |
Recorded Balance | 2,937 |  | 2,937 |  |
Unpaid Principal Balance | 2,937 |  | 2,937 |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |
Average Recorded Investment | $ 1,680 | $ 357 | $ 1,015 | $ 179 |

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