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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
$ in Thousands
 3 Months Ended
Feb. 07, 2017
USD ($)
Mar. 31, 2018
USD ($)
contract
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Derivative [Line Items]        
Notional amount   $ 2,797,967   $ 2,510,937
Cash collateral pledged   2,600    
Amortized cost of securities pledged as collateral to derivative counterparties   14,500    
Fair value of securities as pledged collateral to derivative counterparties   14,500    
Interest expense   21,770 $ 13,823  
Commercial counterparties        
Derivative [Line Items]        
Net asset position   12,200   1,100
Amount Reclassified From Accumulated Other Comprehensive Income (loss) | Accumulated net gain (loss) from cash flow hedges        
Derivative [Line Items]        
Interest expense $ 6,600      
Interest rate swaps        
Derivative [Line Items]        
Notional amount   10,600    
Cash collateral pledged   2,097   1,960
Derivative liability   17,393   11,315
Amount of collateral posted for the net liability positions   2,100   5,900
Interest rate swaps | Commercial counterparties        
Derivative [Line Items]        
Cash collateral pledged   0   0
Net asset position   4,100   8,600
Derivative liability   15,296   5,373
Interest rate swaps | Institutional counterparties        
Derivative [Line Items]        
Cash collateral pledged   2,097   1,960
Derivative liability   2,097   5,942
Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount   296,247   $ 193,966
Economic hedges        
Derivative [Line Items]        
Notional amount   2,500,000    
Credit valuation adjustments   $ 237    
Economic hedges | Tax advantaged economic development bonds        
Derivative [Line Items]        
Fixed rate of interest (as percent)   5.09%    
Maturity period (in years)   21 years    
Economic hedges | Interest rate swaps        
Derivative [Line Items]        
Notional amount   $ 2,000,000    
Economic hedges | Risk participation agreements with dealer banks        
Derivative [Line Items]        
Notional amount   200,000    
Economic hedges | Forward sale commitments        
Derivative [Line Items]        
Notional amount   $ 300,000    
Cash flow hedges        
Derivative [Line Items]        
Durations of derivative instruments (in years)   3 years    
Amount of ineffectiveness   $ 0 $ 0  
Cash flow hedges | Interest rate swaps        
Derivative [Line Items]        
Number of instruments (contract) | contract   6    
Cash flow hedges | Interest rate swaps | FHLB borrowings        
Derivative [Line Items]        
Notional amount $ 300,000 $ 300,000