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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended					9 Months Ended			3 Months Ended				9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended			3 Months Ended	12 Months Ended				9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended			9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Mar. 31, 2014 FHLBB borrowings	Sep. 30, 2014 Cash flow hedges	Dec. 31, 2013 Cash flow hedges	Sep. 30, 2014 Economic hedges	Dec. 31, 2013 Economic hedges	Sep. 30, 2014 Economic hedges Tax advantaged economic development bonds	Sep. 30, 2014 Non-hedging derivatives	Dec. 31, 2013 Non-hedging derivatives	Mar. 31, 2014 Interest rate swaps FHLBB borrowings	Mar. 31, 2014 Interest rate swaps 90 day rolling FHLB advances	Sep. 30, 2014 Interest rate swaps Cash flow hedges	Sep. 30, 2013 Interest rate swaps Cash flow hedges	Sep. 30, 2014 Interest rate swaps Cash flow hedges	Sep. 30, 2013 Interest rate swaps Cash flow hedges	Sep. 30, 2014 Interest rate swaps Cash flow hedges FHLBB borrowings	Sep. 30, 2013 Interest rate swaps Cash flow hedges FHLBB borrowings	Sep. 30, 2014 Interest rate swaps Cash flow hedges FHLBB borrowings	Sep. 30, 2013 Interest rate swaps Cash flow hedges FHLBB borrowings	Dec. 31, 2013 Interest rate swaps Cash flow hedges FHLBB borrowings	Sep. 30, 2014 Interest rate swaps Cash flow hedges FHLBB borrowings Weighted Average	Dec. 31, 2013 Interest rate swaps Cash flow hedges FHLBB borrowings Weighted Average	Sep. 30, 2013 Interest rate swaps Cash flow hedges Junior subordinated notes	Sep. 30, 2014 Interest rate swaps Cash flow hedges Junior subordinated notes	Sep. 30, 2013 Interest rate swaps Cash flow hedges Junior subordinated notes	Dec. 31, 2013 Interest rate swaps Cash flow hedges Junior subordinated notes	Sep. 30, 2014 Interest rate swaps Cash flow hedges Junior subordinated notes Weighted Average	Dec. 31, 2013 Interest rate swaps Cash flow hedges Junior subordinated notes Weighted Average	Sep. 30, 2014 Interest rate swaps Economic hedges	Sep. 30, 2014 Interest rate swaps Economic hedges Tax advantaged economic development bonds	Dec. 31, 2013 Interest rate swaps Economic hedges Tax advantaged economic development bonds	Sep. 30, 2014 Interest rate swaps Economic hedges Tax advantaged economic development bonds Weighted Average	Dec. 31, 2013 Interest rate swaps Economic hedges Tax advantaged economic development bonds Weighted Average	Sep. 30, 2014 Interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2013 Interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2014 Interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2013 Interest rate swaps Economic hedges Loans with commercial loan customers	Dec. 31, 2013 Interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2014 Interest rate swaps Economic hedges Loans with commercial loan customers Weighted Average	Dec. 31, 2013 Interest rate swaps Economic hedges Loans with commercial loan customers Weighted Average	Sep. 30, 2014 Interest rate swaps Economic hedges Industrial revenue bond	Sep. 30, 2013 Interest rate swaps Economic hedges Industrial revenue bond	Sep. 30, 2014 Interest rate swaps Economic hedges Industrial revenue bond	Sep. 30, 2013 Interest rate swaps Economic hedges Industrial revenue bond	Mar. 31, 2014 Forward-starting interest rate swaps 90 day rolling FHLB advances	Sep. 30, 2014 Forward-starting interest rate swaps Cash flow hedges item	Sep. 30, 2014 Forward-starting interest rate swaps Cash flow hedges FHLBB borrowings	Dec. 31, 2013 Forward-starting interest rate swaps Cash flow hedges FHLBB borrowings	Sep. 30, 2014 Forward-starting interest rate swaps Cash flow hedges FHLBB borrowings Weighted Average	Dec. 31, 2013 Forward-starting interest rate swaps Cash flow hedges FHLBB borrowings Weighted Average	Sep. 30, 2014 Reverse interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2013 Reverse interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2014 Reverse interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2013 Reverse interest rate swaps Economic hedges Loans with commercial loan customers	Dec. 31, 2013 Reverse interest rate swaps Economic hedges Loans with commercial loan customers	Sep. 30, 2014 Reverse interest rate swaps Economic hedges Loans with commercial loan customers Weighted Average	Dec. 31, 2013 Reverse interest rate swaps Economic hedges Loans with commercial loan customers Weighted Average	Sep. 30, 2014 Interest rate lock commitments Non-hedging derivatives	Sep. 30, 2013 Interest rate lock commitments Non-hedging derivatives	Sep. 30, 2014 Interest rate lock commitments Non-hedging derivatives	Sep. 30, 2013 Interest rate lock commitments Non-hedging derivatives	Dec. 31, 2013 Interest rate lock commitments Non-hedging derivatives	Sep. 30, 2014 Interest rate lock commitments Non-hedging derivatives Weighted Average	Dec. 31, 2013 Interest rate lock commitments Non-hedging derivatives Weighted Average	Sep. 30, 2014 Forward sale commitments Economic hedges	Sep. 30, 2013 Forward sale commitments Economic hedges	Sep. 30, 2014 Forward sale commitments Economic hedges	Sep. 30, 2013 Forward sale commitments Economic hedges	Dec. 31, 2013 Forward sale commitments Economic hedges	Sep. 30, 2014 Forward sale commitments Economic hedges Weighted Average	Dec. 31, 2013 Forward sale commitments Economic hedges Weighted Average
Derivative instruments and hedging activities
Cash pledged as collateral to derivative counterparties	$ 1,200,000		$ 1,200,000
Amortized cost of securities pledged as collateral to derivative counterparties	23,200,000		23,200,000
Fair value of securities as pledged collateral to derivative counterparties	23,400,000		23,400,000
Interest rate swap agreements and non-hedging derivative assets and liabilities
Notional Amount	999,018,000		999,018,000		905,071,000		300,000,000	425,000,000	658,111,000	459,872,000		40,907,000	20,199,000											150,000,000						15,000,000			593,700,000	12,693,000	13,095,000			290,513,000		290,513,000		206,933,000									300,000,000	260,000,000			290,513,000		290,513,000		206,933,000			40,907,000		40,907,000		20,199,000			64,392,000		64,392,000		32,911,000
Weighted Average Maturity																									0 years	2 years 6 months					0 years	4 months 24 days				15 years 2 months 12 days	15 years 10 months 24 days						6 years	5 years 4 months 24 days									4 years 6 months	4 years 6 months						6 years	5 years 4 months 24 days						2 months 12 days	2 months 12 days						2 months 12 days	2 months 12 days
Weighted Average Rate, Received (as a percent)																								0.25%						2.09%				0.52%	0.54%			2.31%		2.31%		2.44%									0.00%				4.52%		4.52%		4.68%
Weighted Average Rate, Contract pay rate (as a percent)																								2.61%						5.54%				5.09%	5.09%			4.52%		4.52%		4.68%									2.29%	1.88%			2.31%		2.31%		2.44%
Estimated Fair Value Asset (Liability)	(1,854,000)		(1,854,000)		(3,652,000)		(42,000)	(2,290,000)	(2,195,000)	(1,620,000)		383,000	258,000											(3,102,000)						(203,000)				(2,258,000)	(1,889,000)			(8,555,000)		(8,555,000)		(6,278,000)									(42,000)	1,015,000			8,643,000		8,643,000		6,286,000			383,000		383,000		258,000			(25,000)		(25,000)		261,000
Cash flow hedges:
Number of instruments																																																		6
Durations of derivative instruments																																																		3 years
Interest rate swaps on FHLBB borrowings:
Unrealized (loss) gain recognized in accumulated other comprehensive loss																				979,000	(2,155,000)	(3,148,000)	3,280,000				(9,000)	(1,000)	(14,000)
Reclassification of unrealized (loss) gain from accumulated other comprehensive loss to interest expense	7,107,000	8,635,000	20,982,000	26,172,000																	803,000		2,713,000				131,000	204,000	387,000
Reclassification of unrealized loss from accumulated other comprehensive loss to other non-interest income for termination of swaps																					236,000	8,630,000	707,000
Reclassification of unrealized deferred tax benefit from accumulated other comprehensive loss to tax expense for terminated swaps																					(95,000)	(3,611,000)	(395,000)
Net tax benefit (expense) on items recognized in accumulated other comprehensive loss																				(396,000)	597,000	1,270,000	(2,358,000)				(47,000)	(80,000)	(149,000)
Other comprehensive income recorded in accumulated other comprehensive loss, net of reclassification adjustments and tax effects																583,000	(539,000)	3,264,000	4,171,000
Net interest expense recognized in interest expense	2,230,000	3,357,000	6,906,000	10,479,000																	913,000		3,232,000				131,000	204,000	387,000
Notional amount of derivative contract terminated														30,000,000	145,000,000																																		235,000,000
Extinguishment of FHLB advances						215,000,000
Loss reclassified from the effective portion of the unrealized changes in the fair value of the derivatives						8,600,000
Fixed rate of interest (as a percent)											5.09%
Life of the bond											21 years
Credit valuation adjustments									28,400
Economic hedges and non-hedging derivatives
Unrealized (loss) gain recognized in other non-interest income																																						391,000	154,000	(1,341,000)	6,704,000				(84,000)	(32,000)	(815,000)	740,000							(391,000)	(154,000)	1,341,000	(6,704,000)				383,000	976,000	1,420,000	976,000				(25,000)	(822,000)	(694,000)	(822,000)
Favorable (Unfavorable) change in credit valuation adjustment recognized in other non-interest income																																																							59,000	(5,000)	70,000	332,000
Realized gain (loss) in other non-interest income																																																														$ 711,000	$ (63,000)	$ 1,746,000	$ (3,423,000)				$ (75,000)	$ 231,000	$ (417,000)	$ 8,377,000

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount of gain (loss) from the ineffectiveness of the hedge.

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- Definition

Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580

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X

- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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