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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (Revision in interest income with an income tax adjustment, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Revision in interest income with an income tax adjustment
 
Out of Period Adjustments  
Increase in net income due to out of period adjustments $ 1.4us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= bhlb_RevisionInInterestIncomeWithIncomeTaxRelatedComponentMember