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BORROWED FUNDS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Borrowings and junior subordinated debentures
Short-term borrowings	$ 1,082,044	$ 1,071,200
Long-term borrowings	231,953	192,118
Total borrowings	$ 1,313,997	$ 1,263,318
Weighted average rate on short-term borrowings (percent)	0.72%	0.43%
Weighted average rate on long-term borrowings (percent)	3.35%	3.88%
Weighted average interest rate (percent)	1.19%	0.96%
Advances from the FHLBB
Borrowings and junior subordinated debentures
Short-term borrowings	$ 1,072,044	$ 1,071,200
Long-term borrowings	$ 142,792	$ 103,135
Weighted average rate on short-term borrowings (percent)	0.71%	0.43%
Weighted average rate on long-term borrowings (percent)	1.53%	1.89%
Other Borrowings
Borrowings and junior subordinated debentures
Short-term borrowings	$ 10,000	$ 0
Weighted average rate on short-term borrowings (percent)	2.42%	0.00%
Subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings	$ 73,697	$ 73,519
Weighted average rate on long-term borrowings (percent)	7.00%	7.00%
Junior subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings	$ 15,464	$ 15,464
Weighted average rate on long-term borrowings (percent)	2.77%	2.23%

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