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ACCUMULATED OTHER COMPREHENSIVE INCOME - Changes in Accumulated Other Comprehensive Income by Component, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Changes in Other Comprehensive Income by Component, Net of Tax [Roll Forward] |  |  |  |
Balance | $ 129,379 | $ 80,024 | $ 122,529 | $ 78,043
Balance | 134,768 | 82,245 | 134,768 | 82,245
Accumulated Other Comprehensive Income [Member] |  |  |  |
Changes in Other Comprehensive Income by Component, Net of Tax [Roll Forward] |  |  |  |
Balance | 310 | 323 | 256 | 156
Other comprehensive income (loss) | (264) | 94 | (210) | 261
Amount reclassified from accumulated other comprehensive income | (81) | (191) | (81) | (191)
Balance | (35) | 226 | (35) | 226
Unrealized Gains and Losses on Available-for-Sale Debt Securities |  |  |  |
Changes in Other Comprehensive Income by Component, Net of Tax [Roll Forward] |  |  |  |
Balance | 310 | 323 | 256 | 156
Other comprehensive income (loss) | (264) | 94 | (210) | 261
Amount reclassified from accumulated other comprehensive income | (81) | (191) | (81) | (191)
Balance | $ (35) | $ 226 | $ (35) | $ 226

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