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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Identifiable Intangible Assets [Abstract]    
Gross Carrying Amount $ 159,865 $ 159,865
Accumulated Amortization (110,276) (106,925)
Net Carrying Amount 49,589 52,940
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Apr - Dec 2021 9,289  
2022 10,844  
2023 9,082  
2024 7,551  
2025 6,374  
Thereafter 6,449  
Net Carrying Amount 49,589 52,940
Components of goodwill [Abstract]    
Goodwill, net, beginning of period 793,708  
Goodwill, net, activity (252)  
Goodwill, net, end of period 793,456  
Core deposit intangibles [Member]    
Identifiable Intangible Assets [Abstract]    
Gross Carrying Amount 69,403 69,403
Accumulated Amortization (56,896) (55,572)
Net Carrying Amount 12,507 13,831
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net Carrying Amount 12,507 13,831
Other intangibles [Member]    
Identifiable Intangible Assets [Abstract]    
Gross Carrying Amount 90,462 90,462
Accumulated Amortization (53,380) (51,353)
Net Carrying Amount 37,082 39,109
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net Carrying Amount $ 37,082 $ 39,109