GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Carrying Amount of Goodwill by Operating Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill and other intangibles assets
Total goodwill	$ 317,873	$ 317,873
Banking
Goodwill and other intangibles assets
Total goodwill	294,773	294,773
Wealth Management
Goodwill and other intangibles assets
Total goodwill	14,108	14,108
FirsTech
Goodwill and other intangibles assets
Total goodwill	$ 8,992	$ 8,992