BORROWED FUNDS (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Borrowings and junior subordinated debentures
Short-term borrowings	$ 114,390,000	$ 163,150,000
Long-term borrowings	284,840,000	284,938,000
Total borrowings	399,230,000	448,088,000
Weighted average rate on short-term borrowings (as a percent)	0.32%	0.38%
Weighted average rate on long-term borrowings (as a percent)	1.96%	2.76%
Weighted Average Rate (as a percent)	2.04%	1.89%
Secured line of credit	3,000,000
Outstanding balance on FHLBB line of credit	0	0
Advances from the FHLB
Borrowings and junior subordinated debentures
Short-term borrowings	114,390,000	153,150,000
Long-term borrowings	195,208,000	195,321,000
Weighted average rate on short-term borrowings (as a percent)	0.32%	0.28%
Weighted average rate on long-term borrowings (as a percent)	1.14%	1.18%
Callable advances
Borrowings and junior subordinated debentures
Long-term borrowings	5,000,000	5,000,000
Amortizing advances
Borrowings and junior subordinated debentures
Long-term borrowings	5,600,000	5,600,000
Junior subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings	74,168,000	74,153,000
Weighted average rate on long-term borrowings (as a percent)	7.00%	7.00%
Other junior subordinated notes
Borrowings and junior subordinated debentures
Long-term borrowings	15,464,000	15,464,000
Weighted average rate on long-term borrowings (as a percent)	2.14%	2.16%
Other borrowings
Borrowings and junior subordinated debentures
Short-term borrowings		$ 10,000,000
Weighted average rate on short-term borrowings (as a percent)		1.96%