BORROWED FUNDS (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Borrowings and junior subordinated debentures
Short-term borrowings	$ 900,000,000	$ 872,510,000
Long-term borrowings	153,892,000	191,597,000
Total borrowings	1,053,892,000	1,064,107,000
Weighted average rate on short-term borrowings (as a percent)	0.21%	0.24%
Weighted average rate on long-term borrowings (as a percent)	3.98%	3.53%
Weighted Average Rate (as a percent)	0.76%	0.83%
Secured line of credit	3,000,000
Advances from the FHLB
Borrowings and junior subordinated debentures
Short-term borrowings	900,000,000	862,510,000
Long-term borrowings	64,179,000	101,918,000
Weighted average rate on short-term borrowings (as a percent)	0.21%	0.22%
Weighted average rate on long-term borrowings (as a percent)	0.94%	1.23%
Outstanding balance on FHLBB line of credit	0	0
Advances from the FHLB, callable advances
Borrowings and junior subordinated debentures
Long-term borrowings	5,000,000	5,000,000
Advances from the FHLB, amortizing advances
Borrowings and junior subordinated debentures
Long-term borrowings	5,400,000	5,500,000
Federal Reserve Bank Advances
Borrowings and junior subordinated debentures
Short-term borrowings	0	0
Subordinated borrowings
Borrowings and junior subordinated debentures
Long-term borrowings	74,249,000	74,215,000
Weighted average rate on long-term borrowings (as a percent)	7.00%	7.00%
Junior subordinated debentures
Borrowings and junior subordinated debentures
Long-term borrowings	15,464,000	15,464,000
Weighted average rate on long-term borrowings (as a percent)	2.08%	2.09%
Other Borrowings
Borrowings and junior subordinated debentures
Short-term borrowings		$ 10,000,000
Weighted average rate on short-term borrowings (as a percent)		1.92%