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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Identifiable Intangible Assets    
Gross Carrying Amount $ 211,676 $ 203,292
Accumulated Amortization (158,154) (150,701)
Net Carrying Amount 53,522 52,591
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Jul - Dec 2024 6,737  
2025 12,100  
2026 10,645  
2027 4,925  
2028 3,727  
Thereafter 15,388  
Net Carrying Amount 53,522 52,591
Components of goodwill    
Goodwill, beginning of period 845,396  
Goodwill, additions 6,862  
Goodwill, end of period 852,258  
Core deposit intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 77,373 77,373
Accumulated Amortization (70,922) (69,214)
Net Carrying Amount 6,451 8,159
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount 6,451 8,159
Other intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 134,303 125,919
Accumulated Amortization (87,232) (81,487)
Net Carrying Amount 47,071 44,432
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount $ 47,071 $ 44,432