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Regulatory Capital - Additional Information (Detail) | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2015
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Schedule Of Regulatory Assets And Liabilities [Line Items] |  |  |
Capital conservation buffer |  | 1.25% | 0.00%
Scenario, Forecast [Member] |  |  |
Schedule Of Regulatory Assets And Liabilities [Line Items] |  |  |
Capital conservation buffer | 2.50% |  |

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- Definition Capital conservation buffer percentage. + References No definition available. + Details
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Namespace Prefix: | hbnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Schedule Of Regulatory Assets And Liabilities [Line Items] + References No definition available. + Details
Name: | hbnc_ScheduleOfRegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | hbnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |