GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of other intangible asset disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Goodwill and other intangibles assets
Intangible assets, gross	$ 132,203	$ 132,203
Accumulated amortization	85,780	74,152
Total estimated amortization expense	46,423	58,051
Core deposit intangible
Goodwill and other intangibles assets
Intangible assets, gross	99,065	99,065
Accumulated amortization	63,476	55,161
Total estimated amortization expense	35,589	43,904
Customer relationship intangible
Goodwill and other intangibles assets
Intangible assets, gross	33,138	33,138
Accumulated amortization	22,304	18,991
Total estimated amortization expense	$ 10,834	$ 14,147