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Loans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Period of loan sold | 30 days
Minimum period seldom held | 90 days
Mortgage warehousing maximum pay off period | 30 days

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- Definition Minimum period seldom held. + References No definition available. + Details
Name: | hbnc_MinimumPeriodSeldomHeld
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Mortgage warehousing maximum pay off period. + References No definition available. + Details
Name: | hbnc_MortgageWarehousingMaximumPayOffPeriod
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of loan sold by mortgage company. + References No definition available. + Details
Name: | hbnc_PeriodOfLoanSoldByMortgageCompany
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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