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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 150,274 $ 149,437
Accumulated amortization (63,315) (58,779)
Net carrying amount 86,959 90,658
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Apr - Dec 2018 13,318  
2019 15,247  
2020 12,680  
2021 10,817  
2022 9,288  
Thereafter 25,609  
Net carrying amount 86,959 90,658
Components of goodwill [Abstract]    
Goodwill, beginning of period 739,254  
Goodwill, activity (805)  
Goodwill, end of period 738,449  
Accumulated impairment, beginning of period (4,824)  
Accumulated impairment, activity 0  
Accumulated impairment, end of period (4,824)  
Goodwill, net, beginning of period 734,430  
Goodwill, net, activity (805)  
Goodwill, net, end of period 733,625  
Core Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 62,902 62,902
Accumulated amortization (39,621) (37,877)
Net carrying amount 23,281 25,025
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net carrying amount 23,281 25,025
Other Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 87,372 86,535
Accumulated amortization (23,694) (20,902)
Net carrying amount 63,678 65,633
Estimated aggregate amortization expense for each of five succeeding fiscal years [Abstract]    
Net carrying amount $ 63,678 $ 65,633