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LOANS (Details) (USD $)	12 Months Ended
LOANS (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loans
Loans	$ 3,988,654,000	$ 2,956,570,000
Unamortized net loan origination costs	6,552,000	5,163,000
Unamortized net premium on purchased loans	4,055,000	251,000
Total unamortized net costs and premiums	10,607,000	5,414,000
Loans purchased	166,500,000
Loans sold	780,000,000	75,200,000
Net gains on sales of loans	11,800,000	257,000	851,000
Loans pledged as collateral to the Federal Reserve Bank of Boston	87,000,000
Commitments outstanding to related parties	18,500,000	34,300,000
Amount of loan relationship	10,000,000	33,400,000
Activity in the accretable yield for the acquired loan portfolio
Balance at beginning of period	1,277,000
Acquisitions	11,814,000	3,553,000
Sales		(648,000)
Accretion	(4,844,000)	(1,628,000)
Balance at end of period	8,247,000	1,277,000
Non-depository organization
Loans
Amount of loan relationship	8,000,000
Origination in loan commitments	650,000
Operators of non-residential buildings
Loans
Loans	493,500,000	365,000,000
Loans to operators of non-residential buildings (as a percent)	12.40%	12.30%
Loans from Business Activities
Loans
Loans	2,625,636,000	2,262,251,000	2,142,162,000
Loans from Business Combinations
Loans
Loans	1,363,018,000	694,319,000
Carrying amount of loans considered impaired at the acquisition date		62,000,000
Carrying amount of loans not considered impaired at the acquisition date		1,300,000,000
Residential mortgages
Loans
Loans	1,324,251,000	1,020,435,000
Residential mortgages \| Loans from Business Activities
Loans
Loans	890,666,000	681,658,000	644,973,000
Residential mortgages \| Loans from Business Combinations
Loans
Loans	433,585,000	338,777,000
Commercial mortgages
Loans
Loans	1,413,544,000	1,156,241,000
Commercial mortgages \| Loans from Business Activities
Loans
Loans	962,893,000	953,438,000	925,573,000
Commercial mortgages \| Loans from Business Combinations
Loans
Loans	450,651,000	202,803,000
Commercial business loans
Loans
Loans	600,126,000	410,292,000
Commercial business loans \| Loans from Business Activities
Loans
Loans	489,927,000	361,766,000	286,087,000
Commercial business loans \| Loans from Business Combinations
Loans
Loans	110,199,000	48,526,000
Commercial loans
Loans
Loans	2,013,670,000	1,566,533,000
Commercial loans \| Loans from Business Activities
Loans
Loans	1,452,820,000	1,315,204,000
Commercial loans \| Loans from Business Combinations
Loans
Loans	560,850,000	251,329,000
Consumer loans
Loans
Loans	650,733,000	369,602,000
Consumer loans \| Loans from Business Activities
Loans
Loans	282,150,000	265,389,000	285,529,000
Consumer loans \| Loans from Business Combinations
Loans
Loans	368,583,000	104,213,000
1-4 family \| Residential mortgages
Loans
Loans	1,297,532,000	978,874,000
1-4 family \| Residential mortgages \| Loans from Business Activities
Loans
Loans	870,322,000	649,467,000
1-4 family \| Residential mortgages \| Loans from Business Combinations
Loans
Loans	427,210,000	329,407,000
Construction \| Residential mortgages
Loans
Loans	26,719,000	41,561,000
Construction \| Residential mortgages \| Loans from Business Activities
Loans
Loans	20,344,000	32,191,000
Construction \| Residential mortgages \| Loans from Business Combinations
Loans
Loans	6,375,000	9,370,000
Construction \| Commercial mortgages
Loans
Loans	167,825,000	124,218,000
Construction \| Commercial mortgages \| Loans from Business Activities
Loans
Loans	150,694,000	117,492,000
Construction \| Commercial mortgages \| Loans from Business Combinations
Loans
Loans	17,131,000	6,726,000
Single and multi-family \| Commercial mortgages
Loans
Loans	123,820,000	105,799,000
Single and multi-family \| Commercial mortgages \| Loans from Business Activities
Loans
Loans	43,332,000	89,401,000
Single and multi-family \| Commercial mortgages \| Loans from Business Combinations
Loans
Loans	80,488,000	16,398,000
Commercial real estate \| Commercial mortgages
Loans
Loans	1,121,899,000	926,224,000
Commercial real estate \| Commercial mortgages \| Loans from Business Activities
Loans
Loans	768,867,000	746,545,000
Commercial real estate \| Commercial mortgages \| Loans from Business Combinations
Loans
Loans	353,032,000	179,679,000
Asset based lending \| Commercial business loans
Loans
Loans	258,095,000	153,271,000
Asset based lending \| Commercial business loans \| Loans from Business Activities
Loans
Loans	255,265,000	151,065,000
Asset based lending \| Commercial business loans \| Loans from Business Combinations
Loans
Loans	2,830,000	2,206,000
Other commercial business loans \| Commercial business loans
Loans
Loans	342,031,000	257,021,000
Other commercial business loans \| Commercial business loans \| Loans from Business Activities
Loans
Loans	234,662,000	210,701,000
Other commercial business loans \| Commercial business loans \| Loans from Business Combinations
Loans
Loans	107,369,000	46,320,000
Home equity \| Consumer loans
Loans
Loans	325,401,000	298,196,000
Home equity \| Consumer loans \| Loans from Business Activities
Loans
Loans	205,892,000	226,369,000
Home equity \| Consumer loans \| Loans from Business Combinations
Loans
Loans	119,509,000	71,827,000
Other \| Consumer loans
Loans
Loans	325,332,000	71,406,000
Other \| Consumer loans \| Loans from Business Activities
Loans
Loans	76,258,000	39,020,000
Other \| Consumer loans \| Loans from Business Combinations
Loans
Loans	$ 249,074,000	$ 32,386,000