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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Aug. 10, 2012
Business Acquisition [Line Items]      
Goodwill $ 4,935us-gaap_Goodwill $ 4,935us-gaap_Goodwill  
Balance of core deposit intangibles 562us-gaap_FiniteLivedIntangibleAssetsNet 655us-gaap_FiniteLivedIntangibleAssetsNet  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Finite-Lived Intangible Assets, Amortization Expense, Year Six 92bhb_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix    
Finite-Lived Intangible Assets, Amortization Expense, Year Seven 11bhb_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven    
Border Trust Company [Member]      
Business Acquisition [Line Items]      
Goodwill     $ 1,777us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember