GOODWILL AND INTANGIBLE ASSETS (Schedule of Goodwill and Intangible Assets by Operating Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Apr. 01, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,212,710		$ 925,211
Intangible Assets	90,176		19,183
American National
Finite-Lived Intangible Assets [Line Items]
Goodwill	287,499	$ 287,499	0
Wholesale Banking
Finite-Lived Intangible Assets [Line Items]
Goodwill	845,239		639,180
Intangible Assets	9,032		1,302
Wholesale Banking | American National
Finite-Lived Intangible Assets [Line Items]
Goodwill	209,900	209,900
Intangible Assets	8,400
Consumer Banking
Finite-Lived Intangible Assets [Line Items]
Goodwill	362,245		286,031
Intangible Assets	830		989
Consumer Banking | American National
Finite-Lived Intangible Assets [Line Items]
Goodwill	77,600	$ 77,600
Corporate Other
Finite-Lived Intangible Assets [Line Items]
Goodwill	5,226		0
Intangible Assets	80,314		$ 16,892
Corporate Other | American National
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 76,300