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INVESTMENT SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Gain (loss) on investments | $ 638 | $ (16) | $ 4,700
Collateral Pledged |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investment securities pledged to secure public funds | $ 295,600 | $ 398,700 |

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