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BORROWED FUNDS - Summary of Borrowed Funds (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term borrowings |  |
Principal | $ 659,206 | $ 394,480
Weighted Average Rate | 1.29% | 0.93%
Long-term borrowings |  |
Principal | $ 255,878 | $ 142,116
Weighted Average Rate | 2.14% | 1.69%
Total borrowings | $ 915,084 | $ 536,596
Weighted Average Rate | 1.53% | 1.13%
Advances from the FHLBB |  |
Short-term borrowings |  |
Principal | $ 624,032 | $ 372,700
Weighted Average Rate | 1.34% | 0.97%
Long-term borrowings |  |
Principal | $ 212,815 | $ 137,116
Weighted Average Rate | 1.45% | 1.59%
Other borrowings |  |
Short-term borrowings |  |
Principal | $ 35,174 | $ 21,780
Weighted Average Rate | 0.51% | 0.29%
Subordinated borrowings |  |
Long-term borrowings |  |
Principal | $ 38,063 | $ 0
Weighted Average Rate | 5.66% | 0.00%
Junior subordinated borrowings |  |
Long-term borrowings |  |
Principal | $ 5,000 | $ 5,000
Weighted Average Rate | 4.69% | 4.41%

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