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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 149,437 $ 57,541  
Accumulated amortization (58,779) (41,839)  
Net carrying amount 90,658 15,702  
Finite-lived intangible assets, future amortization expense [Abstract]      
2018 17,872    
2019 15,033    
2020 12,497    
2021 10,665    
2022 9,165    
Thereafter 25,426    
Net carrying amount 90,658 15,702  
Components of goodwill [Abstract]      
Goodwill 739,254 469,966 $ 468,076
Goodwill, activity 269,288 1,890  
Accumulated impairment (4,824) (4,824) (4,824)
Accumulated impairment, activity 0 0  
Goodwill, net 734,430 465,142 $ 463,252
Goodwill, net, activity 269,288 1,890  
Servicing Asset at Fair Value, Amount [Roll Forward]      
Carrying value before valuation allowance at beginning of period 1,435 1,472  
Additions 358 481  
Merchants acquisition 64 0  
Amortization (499) (518)  
Carrying value before valuation allowance at end of period 1,358 1,435  
Valuation allowance balance at beginning of period 0 0  
Impairment charges 0 (226)  
Impairment recoveries 0 226  
Valuation allowance balance at end of period 0 0  
Net carrying value at end of period 1,358 1,435  
Fair value of MSRs at end of period 2,473 1,928  
Principal balance of loans sold during the year 32,937 45,852  
Principal balance of loans serviced for others 358,518 365,374  
Custodial escrow balances maintained in connection with loans serviced for others $ 5,363 $ 5,603  
Key economic assumptions used to estimate the value of the MSRs [Abstract]      
Weighted-average contractual life 21 years 3 months 18 days 20 years 9 months 18 days  
Weighted-average constant prepayment rate (CPR) 11.10% 15.10%  
Weighted-average discount rate 3.30% 3.50%  
Core Deposit Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 62,902 $ 39,688  
Accumulated amortization (37,877) (32,581)  
Net carrying amount 25,025 7,107  
Finite-lived intangible assets, future amortization expense [Abstract]      
Net carrying amount 25,025 7,107  
Other Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 86,535 17,853  
Accumulated amortization (20,902) (9,258)  
Net carrying amount 65,633 8,595  
Finite-lived intangible assets, future amortization expense [Abstract]      
Net carrying amount $ 65,633 $ 8,595