SECURITIES (Held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 841,055	$ 838,241
Gross Unrealized Gains	3,158	3,622
Gross Unrealized Losses	(30,461)	(25,464)
Estimated Fair Value	813,752	816,399
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	841,055	838,241
Gross Unrealized Gains	3,158	3,622
Gross Unrealized Losses	(30,461)	(25,464)
Estimated Fair Value	$ 813,752	$ 816,399