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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 |  |

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