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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Unrealized gain on securities available for sale $ 4,018us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 $ 164us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Unamortized gain on securities held to maturity, previously transferred from AFS 1,658hbnc_AccumulatedOtherComprehensiveIncomeLossUnamortizedUnrealizedGainsOnSecuritiesTransferredToHeldToMaturity  
Unrealized loss on derivative instruments (3,337)us-gaap_LossOnDerivativeInstrumentsPretax (2,826)us-gaap_LossOnDerivativeInstrumentsPretax
Tax effect (818)us-gaap_OtherComprehensiveIncomeLossTax 933us-gaap_OtherComprehensiveIncomeLossTax
Total accumulated other comprehensive income (loss) $ 1,521us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax