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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Offsetting Assets [Line Items] |  |
Notional Amount | $ 2,199,862 | $ 1,366,667
Estimated Fair Value Asset (Liability) | (2,804) | (10,676)
Cash flow hedges | Interest rate swap | FHLBB borrowings |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 300,000 |
Economic hedges | Interest rate swap | Tax advantaged economic development bonds |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 11,400 |
Hedging derivatives | Cash flow hedges |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 300,000 | 300,000
Estimated Fair Value Asset (Liability) | (6,573) | (8,532)
Hedging derivatives | Cash flow hedges | Interest rate swap |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 300,000 |
Hedging derivatives | Cash flow hedges | Interest rate swap | FHLBB borrowings |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 300,000 |
Weighted Average Maturity | 2 years 3 months 18 days |
Derivative, weighted average rate, received (percent) | 0.63% |
Derivative, weighted average rate, paid (percent) | 2.29% |
Estimated Fair Value Asset (Liability) | $ (6,573) |
Hedging derivatives | Cash flow hedges | Forward starting interest rate swap | FHLBB borrowings |  |
Offsetting Assets [Line Items] |  |
Notional Amount |  | $ 300,000
Weighted Average Maturity |  | 3 years 3 months 18 days
Derivative, weighted average rate, received (percent) |  | 0.14%
Derivative, weighted average rate, paid (percent) |  | 2.29%
Estimated Fair Value Asset (Liability) |  | $ (8,532)
Hedging derivatives | Economic hedges |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 1,691,717 | 1,030,624
Estimated Fair Value Asset (Liability) | (969) | (2,467)
Hedging derivatives | Economic hedges | Interest rate swap |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 1,300,000 |
Hedging derivatives | Economic hedges | Interest rate swap | Tax advantaged economic development bonds |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 11,386 | $ 11,984
Weighted Average Maturity | 12 years 10 months 24 days | 13 years 10 months 24 days
Derivative, weighted average rate, received (percent) | 0.98% | 0.61%
Derivative, weighted average rate, paid (percent) | 5.09% | 5.09%
Estimated Fair Value Asset (Liability) | $ (2,021) | $ (2,450)
Hedging derivatives | Economic hedges | Interest rate swap | Commercial loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 668,541 | $ 457,392
Weighted Average Maturity | 6 years 2 months 5 days | 6 years 8 months 6 days
Derivative, weighted average rate, received (percent) | 2.43% | 2.18%
Derivative, weighted average rate, paid (percent) | 4.21% | 4.49%
Estimated Fair Value Asset (Liability) | $ (6,752) | $ (17,143)
Hedging derivatives | Economic hedges | Reverse interest rate swaps | Commercial loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 668,541 | $ 457,392
Weighted Average Maturity | 6 years 2 months 5 days | 6 years 8 months 6 days
Derivative, weighted average rate, received (percent) | 4.21% | 4.49%
Derivative, weighted average rate, paid (percent) | 2.43% | 2.18%
Estimated Fair Value Asset (Liability) | $ 7,077 | $ 17,129
Hedging derivatives | Economic hedges | Risk participation agreements |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 83,360 | $ 59,016
Weighted Average Maturity | 11 years 6 months 20 days | 15 years 18 days
Estimated Fair Value Asset (Liability) | $ 5 | $ (56)
Hedging derivatives | Economic hedges | Forward sale commitments |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 259,889 | $ 44,840
Weighted Average Maturity | 2 months 12 days | 2 months 12 days
Estimated Fair Value Asset (Liability) | $ 722 | $ 53
Non-hedging derivatives |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 208,145 | 36,043
Estimated Fair Value Asset (Liability) | 4,738 | 323
Non-hedging derivatives | Commitments to lend |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 208,145 | $ 36,043
Weighted Average Maturity | 2 months 12 days | 2 months 12 days
Estimated Fair Value Asset (Liability) | $ 4,738 | $ 323

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