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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 120,598 $ 57,541  
Accumulated amortization (44,607) (41,839)  
Net carrying amount 75,991 15,702  
Estimated aggregate amortization expense [Abstract]      
Apr - Dec 2017 10,496    
2018 11,918    
2019 9,886    
2020 8,150    
2021 7,119    
Thereafter 28,422    
Net carrying amount 75,991 15,702  
Components of goodwill [Abstract]      
Goodwill 547,810 469,966  
Goodwill, activity 77,844    
Accumulated impairment (4,824) (4,824)  
Accumulated impairment, activity 0    
Goodwill, net 542,986 465,142 $ 465,142
Goodwill, net, activity 77,844    
Core Deposit Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 39,688 39,688  
Accumulated amortization (33,135) (32,581)  
Net carrying amount 6,553 7,107  
Estimated aggregate amortization expense [Abstract]      
Net carrying amount 6,553 7,107  
Other Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 80,910 17,853  
Accumulated amortization (11,472) (9,258)  
Net carrying amount 69,438 8,595  
Estimated aggregate amortization expense [Abstract]      
Net carrying amount $ 69,438 $ 8,595