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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Identifiable Intangible Assets    
Gross Carrying Amount $ 203,076 $ 197,186
Accumulated Amortization (147,138) (136,190)
Total 55,938 60,996
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Oct - Dec 2023 3,563  
2024 12,808  
2025 10,927  
2026 9,625  
2027 4,049  
Thereafter 14,966  
Total 55,938 60,996
Components of goodwill    
Goodwill, beginning of period 841,841  
Goodwill, additions 3,555  
Goodwill, end of period 845,396  
Core deposit intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 77,373 77,373
Accumulated Amortization (68,286) (65,069)
Total 9,087 12,304
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Total 9,087 12,304
Other intangibles    
Identifiable Intangible Assets    
Gross Carrying Amount 125,703 119,813
Accumulated Amortization (78,852) (71,121)
Total 46,851 48,692
Estimated aggregate amortization expense for each of five succeeding fiscal years    
Total $ 46,851 $ 48,692