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BORROWED FUNDS (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Borrowings and junior subordinated debentures
Short-term borrowings	$ 125,000	$ 1,118,832
Long-term borrowings	702,550	398,984
Total borrowings	$ 827,550	$ 1,517,816
Weighted average rate on short-term borrowings (percent)	2.06%	2.58%
Weighted average rate on long-term borrowings (percent)	2.72%	3.16%
Weighted average interest rate (percent)	2.62%	2.73%
Advances from the FHLBB
Borrowings and junior subordinated debentures
Short-term borrowings	$ 125,000	$ 1,118,832
Long-term borrowings	$ 605,501	$ 309,466
Weighted average rate on short-term borrowings (percent)	2.06%	2.58%
Weighted average rate on long-term borrowings (percent)	2.16%	2.17%
Subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings	$ 74,232	$ 74,054
Weighted average rate on long-term borrowings (percent)	7.00%	7.00%
Junior subordinated borrowing - Trust I
Borrowings and junior subordinated debentures
Long-term borrowings	$ 15,464	$ 15,464
Weighted average rate on long-term borrowings (percent)	3.76%	4.50%
Junior subordinated borrowing - Trust II
Borrowings and junior subordinated debentures
Long-term borrowings	$ 7,353	$ 0
Weighted average rate on long-term borrowings (percent)	3.59%	0.00%

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