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Disclosures about Fair Value of Assets and Liabilities - Other Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | $ 7,512 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 9,464 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 7,854 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 7,642 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 7,512 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 9,464 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 7,854 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 7,642 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | 7,512 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 9,464 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Impaired loans | $ 7,854 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 7,642 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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