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BORROWED FUNDS (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Principal    
Total $ 952,576us-gaap_AdvancesFromFederalHomeLoanBanks $ 964,428us-gaap_AdvancesFromFederalHomeLoanBanks
Weighted Average Rate (as a percent)    
Total 0.28%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate 0.32%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
Fixed rate advances    
Principal    
2015 940,900us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
882,525us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
2016 1,519us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
 
2017 5,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
1,583us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
2018   5,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
2019 and beyond 5,157bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
5,320bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
Total 952,576us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
894,428us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
Weighted Average Rate (as a percent)    
2015 0.24%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
0.28%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
2016 0.88%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
 
2017 4.33%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
0.79%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
2018 0.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
4.33%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
2019 and beyond 3.85%bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
3.83%bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
Total 0.28%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
0.35%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankFixedRateAdvancesMember
Variable rate advances    
Principal    
2015   10,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2016   20,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2017   10,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2019 and beyond   30,000bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
Total   $ 70,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
Weighted Average Rate (as a percent)    
2015 0.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
0.32%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2016 0.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
0.30%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2017 0.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
0.30%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2018 0.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
0.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
2019 and beyond 0.00%bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
0.30%bhlb_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueAfterFourYearsOfBalanceSheetDate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
Total 0.00%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember
0.30%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= bhlb_FederalHomeLoanBankVariableRateAdvancesMember