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BORROWED FUNDS - Summary of Borrowed Funds (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Short-term borrowings $ 939,800 $ 1,071,200
Long-term borrowings 198,230 192,118
Total borrowings $ 1,138,030 $ 1,263,318
Weighted average rate on short-term borrowings 0.58% 0.43%
Weighted average rate on long-term borrowings 3.69% 3.88%
Weighted Average Rate 1.12% 0.96%
Advances from the FHLBB    
Debt Instrument [Line Items]    
Short-term borrowings $ 924,800 $ 1,071,200
Long-term borrowings $ 109,114 $ 103,135
Weighted average rate on short-term borrowings 0.55% 0.43%
Weighted average rate on long-term borrowings 1.61% 1.89%
Other Borrowings    
Debt Instrument [Line Items]    
Short-term borrowings $ 15,000 $ 0
Weighted average rate on short-term borrowings 2.17% 0.00%
Subordinated borrowings    
Debt Instrument [Line Items]    
Long-term borrowings $ 73,652 $ 73,519
Weighted average rate on long-term borrowings 7.00% 7.00%
Junior subordinated borrowings    
Debt Instrument [Line Items]    
Long-term borrowings $ 15,464 $ 15,464
Weighted average rate on long-term borrowings 2.67% 2.23%