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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Identifiable Intangible Assets    
Gross Carrying Amount $ 208,926 $ 203,292
Accumulated Amortization (154,277) (150,701)
Net Carrying Amount 54,649 52,591
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Apr - Dec 2024 9,940  
2025 11,604  
2026 10,216  
2027 4,564  
2028 3,434  
Thereafter 14,891  
Net Carrying Amount 54,649 52,591
Components of goodwill    
Goodwill, beginning of period 845,396  
Goodwill, additions 4,394  
Goodwill, end of period 849,790  
Core deposit intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 77,373 77,373
Accumulated Amortization (70,125) (69,214)
Net Carrying Amount 7,248 8,159
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount 7,248 8,159
Other intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 131,553 125,919
Accumulated Amortization (84,152) (81,487)
Net Carrying Amount 47,401 44,432
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount $ 47,401 $ 44,432