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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 171,067 | $ 124,657 | $ 111,000
Ending Balance | 187,630 | 171,067 | 124,657
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 50 | (129) | (124)
Other comprehensive income (loss) | 11 | 116 | (5)
Ending Balance | 61 | 50 | (129)
ASU 2016-01 | Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) |  | 63 |
Available-for-sale Securities [Member] | Changes in fair value of available for sale securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 90 | (58) | (19)
Other comprehensive income (loss) | (3) | 85 | (39)
Ending Balance | 87 | 90 | (58)
Available-for-sale Securities [Member] | ASU 2016-01 | Changes in fair value of available for sale securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) |  | 63 |
Held-to-maturity Securities | Changes in fair value of available for sale securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (40) | (71) | (105)
Other comprehensive income (loss) | 14 | 31 | 34
Ending Balance | $ (26) | (40) | $ (71)
Held-to-maturity Securities | ASU 2016-01 | Changes in fair value of available for sale securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss) |  | $ 0 |

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