GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	May 31, 2021 USD ($)
Goodwill and other intangibles assets
Number of operating segments | segment	3
Goodwill, change in period	$ 0
Total goodwill	317,873,000	$ 317,873,000
CAC
Goodwill and other intangibles assets
Total goodwill			$ 6,337,000
Other intangible assets			$ 17,340,000
Banking
Goodwill and other intangibles assets
Total goodwill	294,773,000	294,773,000
Banking | CAC
Goodwill and other intangibles assets
Total goodwill		6,300,000
Other intangible assets		8,800,000
Wealth Management
Goodwill and other intangibles assets
Total goodwill	$ 14,108,000	14,108,000
Wealth Management | CAC
Goodwill and other intangibles assets
Other intangible assets		$ 8,500,000