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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Identifiable Intangible Assets    
Gross Carrying Amount $ 219,246 $ 213,206
Accumulated Amortization (175,069) (164,960)
Net Carrying Amount 44,177 48,246
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Oct - Dec 2025 3,323  
2026 12,446  
2027 6,458  
2028 4,980  
2029 4,117  
Thereafter 12,853  
Net Carrying Amount 44,177 48,246
Components of goodwill    
Goodwill, beginning of period 853,225  
Goodwill, Additions/Adjustments 2,565  
Goodwill, end of period 855,790  
Core deposit intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 77,373 77,373
Accumulated Amortization (73,802) (72,225)
Net Carrying Amount 3,571 5,148
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount 3,571 5,148
Other intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 141,873 135,833
Accumulated Amortization (101,267) (92,735)
Net Carrying Amount 40,606 43,098
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Net Carrying Amount $ 40,606 $ 43,098