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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Notional amount $ 4,422,594   $ 4,422,594   $ 3,303,570
Cash collateral pledged 78,900   78,900    
Amortized cost of securities pledged as collateral to derivative counterparties 12,000   12,000    
Fair value of securities as pledged collateral to derivative counterparties 12,000   12,000    
Interest expense 37,643 $ 25,192 73,293 $ 46,581  
Commercial counterparties          
Derivative [Line Items]          
Net asset position 500   500   5,900
Interest rate swaps          
Derivative [Line Items]          
Notional amount 10,700   10,700    
Cash collateral pledged 78,896   78,896   25,412
Derivative liability 79,506   79,506   28,593
Amount of collateral posted for the net liability positions 78,900   78,900   25,400
Interest rate swaps | Commercial counterparties          
Derivative [Line Items]          
Cash collateral pledged 0   0   0
Net asset position 75,900   75,900   21,200
Derivative liability 735   735   9,745
Interest rate swaps | Institutional counterparties          
Derivative [Line Items]          
Cash collateral pledged 78,896   78,896   25,412
Derivative liability 78,771   78,771   18,848
Not Designated as Hedging Instrument          
Derivative [Line Items]          
Notional amount 471,456   471,456   $ 165,079
Economic hedges          
Derivative [Line Items]          
Notional amount 4,000,000   4,000,000    
Credit valuation adjustments $ 1,300   $ 1,300    
Economic hedges | Tax advantaged economic development bonds          
Derivative [Line Items]          
Fixed rate of interest 5.09%   5.09%    
Maturity period     21 years    
Economic hedges | Interest rate swaps          
Derivative [Line Items]          
Notional amount $ 3,100,000   $ 3,100,000    
Economic hedges | Risk participation agreements with dealer banks          
Derivative [Line Items]          
Notional amount 300,000   300,000    
Economic hedges | Forward sale commitments          
Derivative [Line Items]          
Notional amount $ 500,000   $ 500,000