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v3.19.3.a.u2

Cash Equivalents - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Cash and Cash Equivalents [Abstract] |
Cash equivalent maximum maturity period | 3 months
Increase in Cash account over the insured limit | $ 22.2
Uninsured Amount | $ 6.7

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- Definition Cash amount exceed over FDIC insured limit. + References No definition available. + Details
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Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash equivalent maximum maturity period. + References No definition available. + Details
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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_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant