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SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 07, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 2,199,862 |  |  |  | $ 1,366,667 |  |  |  | $ 2,199,862 | $ 1,366,667 |
Interest expense |  | 13,276 | $ 12,540 | $ 11,577 | $ 10,779 | $ 9,676 | $ 8,481 | $ 7,766 | $ 7,258 | 48,172 | 33,181 | $ 28,351
FHLBB borrowings | Interest Rate Swap | Cash Flow Hedging |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | $ 300,000 |  |  |  |  |  |  |  | 300,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  | $ 3,981 | $ 0 |
Subsequent Event | Accumulated Net Gain (Loss) from Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 6,600 |  |  |  |  |  |  |  |  |  |  |

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