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Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Unrealized gain on securities available for sale $ 5,856us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 $ 4,018us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Unamortized gain on securities held to maturity, previously transferred from AFS 1,544hbnc_AccumulatedOtherComprehensiveIncomeLossUnamortizedUnrealizedGainsOnSecuritiesTransferredToHeldToMaturity 1,658hbnc_AccumulatedOtherComprehensiveIncomeLossUnamortizedUnrealizedGainsOnSecuritiesTransferredToHeldToMaturity
Unrealized loss on derivative instruments (3,666)us-gaap_LossOnDerivativeInstrumentsPretax (3,337)us-gaap_LossOnDerivativeInstrumentsPretax
Tax effect (1,307)us-gaap_OtherComprehensiveIncomeLossTax (818)us-gaap_OtherComprehensiveIncomeLossTax
Total accumulated other comprehensive income $ 2,427us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 1,521us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax