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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Identifiable Intangible Assets [Abstract]    
Gross Carrying Amount $ 161,302 $ 159,865
Accumulated Amortization (113,522) (106,925)
Net Carrying Amount 47,780 52,940
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Jul - Dec 2021 6,229  
2022 11,141  
2023 9,338  
2024 7,768  
2025 6,550  
Thereafter 6,754  
Net Carrying Amount 47,780 52,940
Components of goodwill [Abstract]    
Goodwill, net, beginning of period 793,708  
Goodwill, net, activity 1,184  
Goodwill, net, end of period 794,892  
Core deposit intangibles [Member]    
Identifiable Intangible Assets [Abstract]    
Gross Carrying Amount 69,403 69,403
Accumulated Amortization (58,136) (55,572)
Net Carrying Amount 11,267 13,831
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net Carrying Amount 11,267 13,831
Other intangibles [Member]    
Identifiable Intangible Assets [Abstract]    
Gross Carrying Amount 91,899 90,462
Accumulated Amortization (55,386) (51,353)
Net Carrying Amount 36,513 39,109
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net Carrying Amount $ 36,513 $ 39,109