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Loan Servicing - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Payments for (Proceeds from) Mortgage Servicing Rights [Abstract] |  |
Unpaid principal balances of loans serviced for others totaled | $ 1,486 | $ 1,532

X
- Definition Principal amount of service loan outstanding. + References No definition available. + Details
Name: | hbnc_PrincipalAmountOfServiceLoanOutstanding
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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