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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 |  | 4,935 us-gaap_Goodwill | $ 4,935 us-gaap_Goodwill
Border Trust Company [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration paid at closing | 133 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Cash and cash equivalents | 1,330 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Securities | 3,537 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Federal Home Loan Bank Common stock | 770 bhb_BusinessAcquisitionPurchasePriceAllocationFederalHomeLoanBankStock / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Loans | 33,606 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Premises and equipment | 563 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Core deposit intangible | 783 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Other | 540 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Total identifiable assets acquired | 41,129 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Deposits | 38,520 bhb_BusinessAcquisitionPurchasePriceAllocationDeposits / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Borrowings | 3,776 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Other liabilities | 477 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Total liabilities assumed | 42,773 us-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 | $ 1,777 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 8 years 6 months |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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