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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
12 Months Ended
Dec. 31, 2014
Loans  
Minimum number of days past due for loans excluding automobile loans on which interest is generally not accrued 90 days
Number of days until which automobile loans accrue, after which they are charged off 20 days
Acquired Loans  
Minimum period of past due for automobile loans to be charged-off 90 days
Allowance for Loan Losses  
Threshold of loan-to-value ratio to originate a loan (as a percent) 80.00%bhlb_ResidentialMortgageLoansRestrictionToOriginateNewLoanLoanToValueRatioMaximum
Threshold of loan-to-value ratio for private mortgage insurance (as a percent) 80.00%bhlb_ResidentialMortgageLoansPrivateMortgageInsuranceRequirementsLoanToValueRatioMinimum
Employee Benefits  
Threshold percentage of amortization of net actuarial gain or loss in net periodic benefit cost over the average remaining service period of active participants in the Plans 10.00%bhlb_DefinedBenefitPlanNetActuarialGainLossThresholdPercentageForAmortizationInNetPeriodicBenefitCostMinimum