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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | $ 175,653 | $ 156,905 | $ 171,067 | [1] | $ 124,657
Balance at end of period |  | 178,008 | 162,338 | 178,008 |  | 162,338
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [2] | (146) | (145) | 50 |  | (129)
Other comprehensive (loss) income | [2] | (33) | 100 | (229) |  | 21
Balance at end of period | [2] | (179) | (45) | (179) |  | (45)
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] | (116) | (81) | 90 |  | (58)
Other comprehensive (loss) income | [2] | (35) | 84 | (241) |  | (2)
Balance at end of period | [2] | (151) | 3 | (151) |  | 3
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] | (30) | (64) | (40) |  | (71)
Other comprehensive (loss) income | [2] | 2 | 16 | 12 |  | 23
Balance at end of period | [2] | $ (28) | $ (48) | $ (28) |  | (48)
Accounting Standards Update 2016-01 |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Other comprehensive (loss) income |  |  |  |  |  | 63
Accounting Standards Update 2016-01 | Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Other comprehensive (loss) income |  |  |  |  |  | 63
Accounting Standards Update 2016-01 | Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Other comprehensive (loss) income |  |  |  |  |  | $ 0
[1] | Derived from audited consolidated financial statements.
[2] | All amounts are net of income taxes.

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