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Commitments, Off Balance Sheets Risk and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |  |
Cash on hand or deposit with Federal Reserve Bank | $ 2,300,000 us-gaap_CashReserveDepositRequiredAndMade |
Commitments to make loans | 408,600,000 hbnc_CommitmentToMakeLoanByCompany | 519,700,000 hbnc_CommitmentToMakeLoanByCompany
Commitments under outstanding standby letters of credit | 3,900,000 hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit | 1,300,000 hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit
Anticipated losses from unused commitments | $ 0 hbnc_AnticipatedLossesFromUnusedCommitments |

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- 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

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- 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

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- 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

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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 305 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792 + Details
Name: | us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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