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Loan Servicing - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Receivables [Abstract] |  |  |
Unpaid principal balances of loans serviced for others totaled | $ 1,035,500,000 hbnc_PrincipalAmountOfServiceLoanOutstanding | $ 943,100,000 hbnc_PrincipalAmountOfServiceLoanOutstanding |
Aggregate fair value of capitalized mortgage servicing rights | 10,500,000 hbnc_CapitalizedMortgageServiceRightFairValue | 9,900,000 hbnc_CapitalizedMortgageServiceRightFairValue | 6,600,000 hbnc_CapitalizedMortgageServiceRightFairValue
Mortgage servicing rights, net | 7,642,000 hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment | 7,039,000 hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment | 5,145,000 hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment
Bank recorded additional (impairment) | $ 51,000 us-gaap_MortgageServicingRightsMSRImpairmentRecovery | $ 635,000 us-gaap_MortgageServicingRightsMSRImpairmentRecovery | $ (168,000)us-gaap_MortgageServicingRightsMSRImpairmentRecovery

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- Definition Capitalized mortgage service right fair value. + References No definition available. + Details
Name: | hbnc_CapitalizedMortgageServiceRightFairValue
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finite lived mortgage servicing rights net of impairment. + References No definition available. + Details
Name: | hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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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- Definition The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6),(7) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
Name: | us-gaap_MortgageServicingRightsMSRImpairmentRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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