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Employee Stock Ownership Plan - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Eligible compensation for ESOP | $ 260,000 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense |  |
Cash contributions and expense recorded for the ESOP | $ 400,000 hbnc_EmployeeStockOwnershipPlanEsopCashContributionAndCompensationExpenses | $ 475,000 hbnc_EmployeeStockOwnershipPlanEsopCashContributionAndCompensationExpenses | $ 475,000 hbnc_EmployeeStockOwnershipPlanEsopCashContributionAndCompensationExpenses
Employee stock ownership plan outstanding shares | 800,339 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP |  |
Percentage of outstanding shares | 8.70%hbnc_PercentageOfEntityOutstandingShareHeldInEmployeeStockOwnershipPlan |  |

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- Definition Employee stock ownership plan ESOP cash contribution and compensation expenses. + References No definition available. + Details
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Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of entity outstanding share held in employee stock ownership plan. + References No definition available. + Details
Name: | hbnc_PercentageOfEntityOutstandingShareHeldInEmployeeStockOwnershipPlan
Namespace Prefix: | hbnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant