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LOANS (Details) (USD $)	12 Months Ended
LOANS (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans
Loans	$ 4,680,600,000	$ 4,180,523,000
Unamortized net loan origination costs	14,268,000bhlb_UnamortizedLoanOriginationFees	13,898,000bhlb_UnamortizedLoanOriginationFees
Unamortized net premium on purchased loans	4,604,000bhlb_UnamortizedDiscountsOrPremiums	3,652,000bhlb_UnamortizedDiscountsOrPremiums
Total unamortized net costs and premiums	18,872,000	17,550,000
Participating serving loans	95,400,000bhlb_ParticipatingServingLoans	84,700,000bhlb_ParticipatingServingLoans
Loans purchased	50,200,000	178,600,000
Loans sold	290,100,000	932,500,000
Net gains (losses) on sales of loans	4,000,000us-gaap_GainLossOnSalesOfLoansNet	(1,000,000)us-gaap_GainLossOnSalesOfLoansNet	11,800,000us-gaap_GainLossOnSalesOfLoansNet
Loans pledged as collateral to the Federal Reserve Bank of Boston	100,000,000us-gaap_LoansPledgedAsCollateral
Commitments outstanding to related parties	3,300,000	2,800,000
Amount of loan relationship	2,000,000	1,200,000
Activity in the accretable yield for the acquired loan portfolio
Balance at beginning of period	2,559,000	8,247,000
Sales		(301,000)
Reclassification from nonaccretable difference for loans with improved cash flows	2,644,000	2,252,000
Accretion	(2,662,000)	(7,639,000)
Balance at end of period	2,541,000	2,559,000	8,247,000
Business Activity
Loans
Loans	3,918,880,000	3,169,191,000
Acquired Loans
Loans
Number of branches	20
Loans	761,720,000	1,011,332,000
Carrying amount of loans considered impaired at the acquisition date	13,800,000	29,900,000
Carrying amount of loans not considered impaired at the acquisition date	13,800,000	29,900,000
Total loans \| Credit concentration \| Operators of non-residential buildings
Loans
Loans	691,300,000	556,750,000.0000
Loans to operators of non-residential buildings (as a percent)	14.80%	13.30%
Other commercial and industrial loans
Loans
Carrying amount of loans considered impaired at the acquisition date	986,000	3,000,000
Residential \| Mortgages
Loans
Loans	1,496,204,000	1,384,274,000
Carrying amount of loans considered impaired at the acquisition date	375,000	329,000
Residential \| Mortgages \| Business Activity
Loans
Loans	1,226,452,000	1,045,895,000
Residential \| Mortgages \| Acquired Loans
Loans
Loans	269,752,000	338,379,000
Carrying amount of loans considered impaired at the acquisition date	375,000	329,000
Residential \| Mortgages \| 1-4 family
Loans
Loans	1,468,142,000	1,361,104,000
Residential \| Mortgages \| 1-4 family \| Business Activity
Loans
Loans	1,199,408,000	1,027,737,000
Residential \| Mortgages \| 1-4 family \| Acquired Loans
Loans
Loans	268,734,000	333,367,000
Carrying amount of loans considered impaired at the acquisition date	375,000	329,000
Residential \| Mortgages \| Construction
Loans
Loans	28,062,000	23,170,000
Residential \| Mortgages \| Construction \| Business Activity
Loans
Loans	27,044,000	18,158,000
Residential \| Mortgages \| Construction \| Acquired Loans
Loans
Loans	1,018,000	5,012,000
Commercial real estate
Loans
Loans	1,611,567,000	1,417,120,000
Carrying amount of loans considered impaired at the acquisition date	12,300,000	26,500,000
Commercial real estate \| Business Activity
Loans
Loans	1,340,076,000	1,060,011,000
Commercial real estate \| Acquired Loans
Loans
Loans	271,491,000	357,109,000
Carrying amount of loans considered impaired at the acquisition date	12,277,000	26,534,000
Commercial real estate \| Construction
Loans
Loans	173,390,000	139,017,000
Commercial real estate \| Construction \| Business Activity
Loans
Loans	169,189,000	125,247,000
Commercial real estate \| Construction \| Acquired Loans
Loans
Loans	4,201,000	13,770,000
Carrying amount of loans considered impaired at the acquisition date	1,296,000	6,616,000
Commercial real estate \| Single and multi-family
Loans
Loans	193,218,000	128,320,000
Commercial real estate \| Single and multi-family \| Business Activity
Loans
Loans	140,050,000	63,493,000
Commercial real estate \| Single and multi-family \| Acquired Loans
Loans
Loans	53,168,000	64,827,000
Carrying amount of loans considered impaired at the acquisition date	5,477,000	9,666,000
Commercial real estate \| Other commercial real estate
Loans
Loans	1,244,959,000	1,149,783,000
Commercial real estate \| Other commercial real estate \| Business Activity
Loans
Loans	1,030,837,000	871,271,000
Commercial real estate \| Other commercial real estate \| Acquired Loans
Loans
Loans	214,122,000	278,512,000
Carrying amount of loans considered impaired at the acquisition date	5,504,000	10,252,000
Commercial real estate \| Business loans
Loans
Loans	804,366,000	687,293,000
Commercial real estate \| Business loans \| Business Activity
Loans
Loans	753,191,000	617,437,000
Commercial real estate \| Business loans \| Acquired Loans
Loans
Loans	51,175,000	69,856,000
Carrying amount of loans considered impaired at the acquisition date	986,000	3,036,000
Commercial real estate \| Business loans \| Asset based lending
Loans
Loans	341,246,000	297,371,000
Commercial real estate \| Business loans \| Asset based lending \| Business Activity
Loans
Loans	341,246,000	294,241,000
Commercial real estate \| Business loans \| Asset based lending \| Acquired Loans
Loans
Loans		3,130,000
Commercial real estate \| Business loans \| Other commercial and industrial loans
Loans
Loans	463,120,000	389,922,000
Commercial real estate \| Business loans \| Other commercial and industrial loans \| Business Activity
Loans
Loans	411,945,000	323,196,000
Commercial real estate \| Business loans \| Other commercial and industrial loans \| Acquired Loans
Loans
Loans	51,175,000	66,726,000
Carrying amount of loans considered impaired at the acquisition date	986,000	3,036,000
Commercial real estate \| Business loans \| Other commercial real estate \| Other commercial and industrial loans \| Business Activity
Loans
Loans	411,945,000
Consumer
Loans
Loans	768,463,000	691,836,000
Carrying amount of loans considered impaired at the acquisition date	171,000
Consumer \| Business Activity
Loans
Loans	599,161,000	445,848,000
Consumer \| Acquired Loans
Loans
Loans	169,302,000	245,988,000
Carrying amount of loans considered impaired at the acquisition date	171,000
Consumer \| Home equity
Loans
Loans	318,632,000	306,831,000
Consumer \| Home equity \| Business Activity
Loans
Loans	252,681,000	232,677,000
Consumer \| Home equity \| Acquired Loans
Loans
Loans	65,951,000	74,154,000
Carrying amount of loans considered impaired at the acquisition date	171,000
Consumer \| Auto and other
Loans
Loans	449,831,000	385,005,000
Consumer \| Auto and other \| Business Activity
Loans
Loans	346,480,000	213,171,000
Consumer \| Auto and other \| Acquired Loans
Loans
Loans	103,351,000	171,834,000
Commercial
Loans
Loans	2,415,933,000	2,104,413,000
Commercial \| Business Activity
Loans
Loans	2,093,267,000	1,677,448,000
Commercial \| Acquired Loans
Loans
Loans	322,666,000	426,965,000
Commercial \| Mortgages \| Acquired Loans
Loans
Loans	271,491,000	357,109,000
Commercial \| Mortgages \| Construction \| Acquired Loans
Loans
Loans	4,201,000	13,770,000
Commercial \| Mortgages \| Single and multi-family \| Acquired Loans
Loans
Loans	53,168,000	64,827,000
Commercial \| Mortgages \| Other commercial real estate \| Acquired Loans
Loans
Loans	214,122,000	278,512,000
Commercial \| Business loans \| Business Activity
Loans
Loans	753,191,000	617,437,000
Commercial \| Business loans \| Acquired Loans
Loans
Loans	51,175,000	69,856,000
Commercial \| Business loans \| Asset based lending \| Business Activity
Loans
Loans	341,246,000	294,241,000
Commercial \| Business loans \| Asset based lending \| Acquired Loans
Loans
Loans		3,130,000
Commercial \| Business loans \| Other commercial and industrial loans \| Business Activity
Loans
Loans	411,945,000	323,196,000
Commercial \| Business loans \| Other commercial and industrial loans \| Acquired Loans
Loans
Loans	$ 51,175,000	$ 66,726,000