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SEGMENT INFORMATION - Reportable segments information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reconciliation of operating profit loss from segment to consolidated
Operating income before income taxes	$ 62,092	$ 61,473	$ 115,135	$ 68,446
Unrealized (loss) gain on equity securities	867	(50)	883	(50)
Amortization of intangible assets	3,877	3,705	7,453	7,372
Acquisition expenses	(104)	1	(139)	(56)
Litigation accrual	0	0	(119)	0
Operating Segment
Reconciliation of operating profit loss from segment to consolidated
Operating income before income taxes	65,438	66,227	122,195	129,011
Banking and Corporate | Operating Segment
Reconciliation of operating profit loss from segment to consolidated
Operating income before income taxes	47,144	50,085	87,168	95,299
Unrealized (loss) gain on equity securities	867	(50)	883	(50)
Amortization of intangible assets	855	1,160	1,828	2,366
Acquisition expenses	0	1	0	(16)
Employee Benefit Services | Operating Segment
Reconciliation of operating profit loss from segment to consolidated
Operating income before income taxes	13,547	11,712	26,407	23,879
Unrealized (loss) gain on equity securities	0	0	0	0
Amortization of intangible assets	1,781	1,632	3,506	3,265
Acquisition expenses	(15)	0	(50)	0
Insurance | Operating Segment
Reconciliation of operating profit loss from segment to consolidated
Operating income before income taxes	2,719	2,219	3,750	5,021
Unrealized (loss) gain on equity securities	0	0	0	0
Amortization of intangible assets	1,047	725	1,720	1,355
Acquisition expenses	(89)	0	(89)	(40)
Wealth Management | Operating Segment
Reconciliation of operating profit loss from segment to consolidated
Operating income before income taxes	2,028	2,211	4,870	4,812
Unrealized (loss) gain on equity securities	0	0	0	0
Amortization of intangible assets	194	188	399	386
Acquisition expenses	$ 0	$ 0	$ 0	$ 0

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