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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | $ 193,325 | $ 175,653 | $ 187,630 | [1] | $ 171,067
Balance at end of period |  | 198,543 | 178,008 | 198,543 |  | 178,008
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [2] | 44 | (146) | 61 |  | 50
Other comprehensive income (loss) | [2] | 77 | (33) | 60 |  | (229)
Balance at end of period | [2] | 121 | (179) | 121 |  | (179)
Accumulated Net Unrealized Investment Gain (Loss) | Available-for-sale Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [2] | 70 | (116) | 87 |  | 90
Other comprehensive income (loss) | [2] | 74 | (35) | 57 |  | (241)
Balance at end of period | [2] | 144 | (151) | 144 |  | (151)
Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [2] | (26) | (30) | (26) |  | (40)
Other comprehensive income (loss) | [2] | 3 | 2 | 3 |  | 12
Balance at end of period | [2] | $ (23) | $ (28) | $ (23) |  | $ (28)
[1] | Derived from audited consolidated financial statements.
[2] | All amounts are net of income taxes.

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