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Financial Derivative Instruments (Schedule of Interest Rate Derivatives) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Financial Derivative Instruments [Abstract]
Unrealized losses on interest rate caps, Gross	$ (1,709)us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	$ (1,111)us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
Unamortized premium on interest rate caps, Gross	4,566bhb_DerivativeUnamortizedPremium	4,566bhb_DerivativeUnamortizedPremium
Total, Gross	2,857us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	3,455us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Unrealized gain on interest rate caps, Net of Tax	(1,111)bhb_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLossNetOfTax	722bhb_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLossNetOfTax
Unamortized premium on interest rate caps, Net of Tax	2,968bhb_DerivativeUnamortizedPremiumNetOfTax	2,968bhb_DerivativeUnamortizedPremiumNetOfTax
Total, Net of Tax	$ 1,857bhb_DerivativeAssetFairValueAmountNotOffsetAgainstCollateralNetOfTax	$ 2,246bhb_DerivativeAssetFairValueAmountNotOffsetAgainstCollateralNetOfTax

X

- Definition

Derivative Asset, Fair Value, Amount Not Offset Against Collateral, Net of Tax

+ References

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- Definition

Derivative , Unamortized Premium

+ References

No definition available.

+ Details

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X

- Definition

Derivative Unamortized Premium, Net of Tax

+ References

No definition available.

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X

- Definition

Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)

+ References

No definition available.

+ Details

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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

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- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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