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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2008
Shareholders' Equity Disclosure [Line Items]
Dividends Available for Distribution	$ 63,387bhb_DividendsAvailableForDistribution
Treasury stock acquired, average cost per share	$ 18.67us-gaap_TreasuryStockAcquiredAverageCostPerShare
Stock repurchased during period, value	8us-gaap_TreasuryStockValueAcquiredCostMethod	24us-gaap_TreasuryStockValueAcquiredCostMethod	181us-gaap_TreasuryStockValueAcquiredCostMethod
Stock Repurchase Plan [Member]
Shareholders' Equity Disclosure [Line Items]
Number of shares approved for repurchase				450,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchasePlanMember
Stock repurchase program, percentage				10.20%bhb_StockRepurchaseProgramPercentageOfSharesOutstandingApprovedForRepurchase / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchasePlanMember
Stock repurchase program, authorized durational period				24 months
Stock repurchased during period, shares	157,757us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchasePlanMember
Stock repurchased during period, value	$ 2,945us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchasePlanMember
Stock Repurchase Plan Current Year Repurchases [Member]
Shareholders' Equity Disclosure [Line Items]
Stock repurchased during period, shares	327us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchaseProgramOfTwoThousandAndFourMember

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-SubTopic 10

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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