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Business Combinations (Summary Of Consideration Paid, Assets Acquired And The Liabilities Assumed, Recorded At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
Aug. 10, 2012
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill resulting from transaction   4,935us-gaap_Goodwill $ 4,935us-gaap_Goodwill
Border Trust Company [Member]      
Business Acquisition [Line Items]      
Cash consideration paid at closing 133us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Cash and cash equivalents 1,330us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Securities 3,537us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Federal Home Loan Bank Common stock 770bhb_BusinessAcquisitionPurchasePriceAllocationFederalHomeLoanBankStock
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Loans 33,606us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Premises and equipment 563us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Core deposit intangible 783us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Other 540us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Total identifiable assets acquired 41,129us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Deposits 38,520bhb_BusinessAcquisitionPurchasePriceAllocationDeposits
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Borrowings 3,776us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Other liabilities 477us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Total liabilities assumed 42,773us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Fair value of net identifiable assets (liabilities) acquired (1,644)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Goodwill resulting from transaction $ 1,777us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bhb_BorderTrustCompanyMember
   
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   8 years 6 months