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Financial Derivative Instruments (Schedule of Notional Amounts of Outstanding Derivative Positions) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |
Unamortized Premium | $ 4,566 bhb_DerivativeUnamortizedPremium | $ 4,566 bhb_DerivativeUnamortizedPremium
Fair Value | 2,857 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 3,455 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Interest Rate Cap [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 90,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember |
Cap Interest Rate |  | 3.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember
Premium Paid |  | 4,566 bhb_DerivativePremium / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember
Fair Value | 2,857 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember |
Interest Rate Cap 1 [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 25,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap1Member |
Expiration Date | Jun. 02, 2021 |
Cap Interest Rate | 3.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap1Member |
Premium Paid | 922 bhb_DerivativePremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap1Member |
Unamortized Premium | 922 bhb_DerivativeUnamortizedPremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap1Member |
Fair Value | 464 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap1Member |
Interest Rate Cap 2 [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 20,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap2Member |
Expiration Date | Jun. 04, 2024 |
Cap Interest Rate | 3.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap2Member |
Premium Paid | 1,470 bhb_DerivativePremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap2Member |
Unamortized Premium | 1,470 bhb_DerivativeUnamortizedPremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap2Member |
Fair Value | 839 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap2Member |
Interest Rate Cap 3 [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 20,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap3Member |
Expiration Date | Oct. 21, 2021 |
Cap Interest Rate | 3.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap3Member |
Premium Paid | 632 bhb_DerivativePremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap3Member |
Unamortized Premium | 632 bhb_DerivativeUnamortizedPremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap3Member |
Fair Value | 428 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap3Member |
Interest Rate Cap 4 [Member] |  |
Derivative [Line Items] |  |
Notional Amount | 25,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap4Member |
Expiration Date | Oct. 21, 2024 |
Cap Interest Rate | 3.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap4Member |
Premium Paid | 1,542 bhb_DerivativePremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap4Member |
Unamortized Premium | 1,542 bhb_DerivativeUnamortizedPremium / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap4Member |
Fair Value | $ 1,126 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = bhb_InterestRateCap4Member |

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- Definition Derivative, Premium + References No definition available. + Details
Name: | bhb_DerivativePremium
Namespace Prefix: | bhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Derivative , Unamortized Premium + References No definition available. + Details
Name: | bhb_DerivativeUnamortizedPremium
Namespace Prefix: | bhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeCapInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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