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BORROWED FUNDS - Summary of Borrowed Funds (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Short-term borrowings
Carrying Value	$ 547,600	$ 394,480
Weighted Average Rate	1.30%	0.93%
Long-term borrowings
Carrying Value	$ 271,030	$ 142,116
Weighted Average Rate	2.11%	1.69%
Total borrowings	$ 818,630	$ 536,596
Weighted Average Rate	1.57%	1.13%
Advances from the FHLBB
Short-term borrowings
Carrying Value	$ 506,000	$ 372,700
Weighted Average Rate	1.36%	0.97%
Long-term borrowings
Carrying Value	$ 227,982	$ 137,116
Weighted Average Rate	1.50%	1.59%
Other borrowings
Short-term borrowings
Carrying Value	$ 41,600	$ 21,780
Weighted Average Rate	0.56%	0.29%
Subordinated borrowings
Long-term borrowings
Carrying Value	$ 38,048	$ 0
Weighted Average Rate	5.46%	0.00%
Junior subordinated borrowings
Long-term borrowings
Carrying Value	$ 5,000	$ 5,000
Weighted Average Rate	4.81%	4.41%

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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