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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Identifiable Intangible Assets [Abstract]    
Gross carrying amount $ 159,865 $ 155,741
Accumulated amortization (103,400) (92,628)
Net carrying amount 56,465 63,113
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Oct - Dec 2020 3,525  
2021 12,640  
2022 10,844  
2023 9,082  
2024 7,551  
Thereafter 12,823  
Net carrying amount 56,465 63,113
Components of goodwill [Abstract]    
Goodwill, net, beginning of period 773,810  
Goodwill, net, activity 19,939  
Goodwill, net, end of period 793,749  
Core Deposit Intangibles [Member]    
Identifiable Intangible Assets [Abstract]    
Gross carrying amount 69,403 66,475
Accumulated amortization (54,217) (50,057)
Net carrying amount 15,186 16,418
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net carrying amount 15,186 16,418
Other Intangibles [Member]    
Identifiable Intangible Assets [Abstract]    
Gross carrying amount 90,462 89,266
Accumulated amortization (49,183) (42,571)
Net carrying amount 41,279 46,695
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net carrying amount $ 41,279 $ 46,695