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Repurchase Agreements - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Repurchase Agreements [Abstract] |  |
Maximum amount of outstanding agreements | $ 61.4 | $ 63.1
Daily average amount of outstanding agreements | $ 51.4 | $ 55.2

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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