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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 | $ 63,387 bhb_DividendsAvailableForDistribution |  |  |
Treasury stock acquired, average cost per share | $ 18.67 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Stock repurchased during period, value | 8 us-gaap_TreasuryStockValueAcquiredCostMethod | 24 us-gaap_TreasuryStockValueAcquiredCostMethod | 181 us-gaap_TreasuryStockValueAcquiredCostMethod |
Stock Repurchase Plan [Member] |  |  |  |
Shareholders' Equity Disclosure [Line Items] |  |  |  |
Number of shares approved for repurchase |  |  |  | 450,000 us-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 | 157,757 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchasePlanMember |  |  |
Stock repurchased during period, value | $ 2,945 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchasePlanMember |  |  |
Stock Repurchase Plan Current Year Repurchases [Member] |  |  |  |
Shareholders' Equity Disclosure [Line Items] |  |  |  |
Stock repurchased during period, shares | 327 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bhb_StockRepurchaseProgramOfTwoThousandAndFourMember |  |  |

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- Definition 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 + Details
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