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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 |  |

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