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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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