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Commitments, Off-Balance Sheet Risk and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |  |
Commitments to make loans | $ 958,700,000 | $ 873,800,000
Commitments under outstanding standby letters of credit | 17,300,000 | $ 4,800,000
Anticipated losses from unused commitments | $ 0 |

X
- Definition Anticipated losses from unused commitments. + References No definition available. + Details
Name: | hbnc_AnticipatedLossesFromUnusedCommitments
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commitment to make loan by company. + References No definition available. + Details
Name: | hbnc_CommitmentToMakeLoanByCompany
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments under outstanding standby letters of credit. + References No definition available. + Details
Name: | hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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