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Accounting for Certain Loans Acquired in a Transfer - Additional Information (Detail) (Loans Purchased With Evidence Of Credit Deterioration [Member], USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Loans Purchased With Evidence Of Credit Deterioration [Member] |  |
Business Acquisition [Line Items] |  |
Allowances for loan losses | $ 105,000 hbnc_ReversalOfAllowanceForLoanReceivable / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember | $ 0 hbnc_ReversalOfAllowanceForLoanReceivable / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember

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- Definition Reversal of allowance for loan receivable. + References No definition available. + Details
Name: | hbnc_ReversalOfAllowanceForLoanReceivable
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration