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Financial Derivative Instruments (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Derivative [Line Items]  
Derivative, Number of Instruments Held 4us-gaap_DerivativeNumberOfInstrumentsHeld
Interest Rate Cap [Member]  
Derivative [Line Items]  
Derivative, Notional Amount $ 90,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Payments for Hedge, Financing Activities 4,566,000us-gaap_PaymentsForHedgeFinancingActivities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Derivative, Cap Interest Rate 3.00%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum 3.00%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Interest Rate Derivative Assets, at Fair Value 3,455,000us-gaap_InterestRateDerivativeAssetsAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
Amount less than of the total premiums recognized as increases to interest expense $ 1bhb_AmountLessThanOfTotalPremiumsRecognizedAsIncreasesToInterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember