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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Asset Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Goodwill and other intangibles assets    
Intangible assets, gross $ 132,203 $ 132,203
Accumulated amortization 96,212 85,780
Total estimated amortization expense 35,991 46,423
Core deposit intangible    
Goodwill and other intangibles assets    
Intangible assets, gross 99,065 99,065
Accumulated amortization 71,092 63,476
Total estimated amortization expense 27,973 35,589
Customer relationship intangible    
Goodwill and other intangibles assets    
Intangible assets, gross 33,138 33,138
Accumulated amortization 25,120 22,304
Total estimated amortization expense $ 8,018 $ 10,834