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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  | $ 238,679 | $ 227,661 | $ 233,073 | [1] | $ 218,569
Balance at end of period |  | 241,223 | 229,263 | 241,223 |  | 229,263
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | [2] | (745) | (495) | (1,084) |  | (717)
Other comprehensive income | [2] | 200 | (249) | 539 |  | (27)
Balance at end of period | [2] | (545) | (744) | (545) |  | (744)
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] | (745) | (486) | (1,075) |  | (706)
Other comprehensive income | [2] | 200 | (249) | 530 |  | (29)
Balance at end of period | [2] | (545) | (735) | (545) |  | (735)
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] | 0 | (9) | (9) |  | (11)
Other comprehensive income | [2] | 0 | 0 | 9 |  | 2
Balance at end of period | [2] | $ 0 | $ (9) | $ 0 |  | $ (9)
[1] | Derived from audited consolidated financial statements.
[2] | All amounts are net of income taxes.

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