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Repurchase Agreements - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Repurchase Agreements [Abstract] |  |
Maximum amount of outstanding agreements | $ 156.2 | $ 144.3
Daily average amount of outstanding agreements | $ 149.9 | $ 140.9
Maturity date | Sep. 13, 2020 |

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- Definition Resale agreements maturity date. + References No definition available. + Details
Name: | hbnc_ResaleAgreementsMaturityDate
Namespace Prefix: | hbnc_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities sold under agreements to repurchase daily average outstanding. + References No definition available. + Details
Name: | hbnc_SecuritiesSoldUnderAgreementsToRepurchaseDailyAverageOutstanding
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Securities sold under agreements to repurchase monthly average outstanding amount. + References No definition available. + Details
Name: | hbnc_SecuritiesSoldUnderAgreementsToRepurchaseMonthlyAverageOutstandingAmount
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfRepurchaseAgreementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration