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Disclosures about Fair Value of Assets and Liabilities - Qualitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements, Other than Goodwill (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	7,512us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	9,464us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Valuation Technique	Collateral based measurement
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability
Mortgage Servicing Rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	7,854us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	7,642us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Valuation Technique	Discounted cashflows
Unobservable Inputs	Discount rate, Constant prepayment rate, Probability of default
Minimum [Member] | Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	10.00%hbnc_DiscountToReflectCurrentMarketConditionsAndUltimateCollectability / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember	10.00%hbnc_DiscountToReflectCurrentMarketConditionsAndUltimateCollectability / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Mortgage Servicing Rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember	10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Constant prepayment rate	4.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember	4.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Probably of default	1.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember	1.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	15.00%hbnc_DiscountToReflectCurrentMarketConditionsAndUltimateCollectability / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember	15.00%hbnc_DiscountToReflectCurrentMarketConditionsAndUltimateCollectability / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Mortgage Servicing Rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember	15.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Constant prepayment rate	7.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember	7.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Probably of default	10.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember	10.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember
Weighted Average [Member] | Impaired Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	12.00%hbnc_DiscountToReflectCurrentMarketConditionsAndUltimateCollectability / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	12.00%hbnc_DiscountToReflectCurrentMarketConditionsAndUltimateCollectability / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Weighted Average [Member] | Mortgage Servicing Rights [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Constant prepayment rate	4.60%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	4.60%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember
Probably of default	4.50%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember	4.50%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember

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Fair value measurement with unobservable inputs recurring and nonrecurring basis excluding goodwill.

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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

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 820

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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

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-Publisher FASB

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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Description of the inputs and valuation technique(s) used to measure fair value.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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