ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]
Unrealized gain (loss) on investment securities	$ 33,525	$ (16,734)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	1,825	(5,521)
Retirement obligation	0	0
Foreign currency translation	5	(301)
Total	35,355	(22,556)
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]
Realized gain (loss) on securities available-for-sale	(9,913)	(7,518)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(199)	(199)
Retirement obligation	(625)	(375)
Foreign currency translation	0	0
Total	(10,737)	(8,092)
Transactions Pre-tax
Unrealized gain (loss) on investment securities	43,438	(9,216)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	2,024	(5,322)
Unfunded pension obligation	625	375
Foreign currency translation	5	(301)
Total	46,092	(14,464)
Transactions Tax-effect
Unrealized gain (loss) on investment securities	(9,568)	2,030
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	468	(1,231)
Retirement obligation	(145)	(87)
Foreign currency translation	0	0
Total	(10,181)	3,174
Transactions Net of tax
Unrealized gain (loss) on investment securities	33,870	(7,186)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	1,556	(4,091)
Retirement obligation	480	288
Foreign currency translation	5	(301)
Total	35,911	(11,290)
Balances Net of tax
Unrealized gain (loss) on investment securities	(222,644)	(289,144)	$ (256,514)	$ (281,958)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	380	(336)	(1,176)	3,755
Retirement obligation	(30,000)	(30,829)	(30,480)	(31,117)
Foreign currency translation	(1,624)	(800)	(1,629)	(499)
Accumulated other comprehensive loss	(253,888)	(321,109)	$ (289,799)	$ (309,819)
Accumulated other comprehensive income (loss)
Transactions Net of tax
Total	$ 35,911	$ (11,290)