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Loans And Allowance For Loan Losses (Summary Of Post-Modification Balance of Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Loans And Allowance For Loan Losses [Abstract]    
Extended maturity and adjusted interest rate $ 97bhb_FinancingReceivableModificationsPostModificationExtendedMaturityAndAdjustedInterestRate $ 79bhb_FinancingReceivableModificationsPostModificationExtendedMaturityAndAdjustedInterestRate
Extended amortization and adjusted interest rate 30bhb_FinancingReceivableModificationsPostModificationExtendedAmortizationAndAdjustedInterestRate  
Court ordered concession   284bhb_FinancingReceivableModificationsPostModificationCourtOrderedConcession
Total $ 127us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 $ 363us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2