SECURITIES (Securities held to maturity) (Details) $ in Thousands	Jun. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 727,436	$ 697,424
Unrealized Losses, Less than 12 months	$ (30,464)	$ (55,942)
Count, Less than 12 months | security	155	155
Fair Value, 12 months or longer	$ 1,522	$ 0
Unrealized Losses, 12 months or longer	$ (42)	$ 0
Count, 12 months or longer | security	1	0
Fair Value, Total	$ 728,958	$ 697,424
Unrealized Losses, Total	$ (30,506)	$ (55,942)
Count, Total | security	156	155
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 727,436	$ 697,424
Unrealized Losses, Less than 12 months	$ (30,464)	$ (55,942)
Count, Less than 12 months | security	155	155
Fair Value, 12 months or longer	$ 1,522	$ 0
Unrealized Losses, 12 months or longer	$ (42)	$ 0
Count, 12 months or longer | security	1	0
Fair Value, Total	$ 728,958	$ 697,424
Unrealized Losses, Total	$ (30,506)	$ (55,942)
Count, Total | security	156	155