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INVESTMENT SECURITIES - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) security | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) security | Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available-for-sale, unrealized loss position, allowance for credit loss | $ 0 |  | $ 0 |  | $ 0
Gains (losses) on investments | 181,000 |  |  |  |
Investment securities | 826,828,000 |  | 826,828,000 |  | 513,519,000
Investment securities gain (loss) | 0 | $ 0 | 0 | $ 0 |
Collateral Pledged |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities pledged to secure public funds, fair value | 735,500,000 |  | 735,500,000 |  | 439,700,000
Equity Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Gains (losses) on investments | 271,000 | 2,000 | 254,000 | (8,000) |
U.S. Treasury securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities | 18,373,000 | $ 19,900,000 | 18,373,000 | $ 19,900,000 | $ 17,840,000
Number of investment securities sold | security |  | 3 |  | 3 |
Debt Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment securities | $ 162,700,000 |  | $ 162,700,000 |  |

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