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INVESTMENT SECURITIES - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) security | Mar. 31, 2023 USD ($) security | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities, available-for-sale, unrealized loss position, allowance for credit loss | $ 0 |  | $ 0 | $ 0
Investment securities sold | security | 0 | 0 |  |
Collateral Pledged |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Investment securities pledged to secure public funds, fair value | $ 448,700,000 |  | $ 439,700,000 |
Equity Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gains (losses) on investments | $ (5,000) | $ (8,000) |  |

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