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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) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount rate | 10.00%us-gaap_FairValueInputsDiscountRate |
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | 9,464 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 6,114 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Valuation Technique | Collateral based measurement |
Valuation Technique | Collateral based measurement |
Unobservable Inputs | Discount to reflect current market conditions and ultimate collectability |
Unobservable Inputs | Discount to reflect current market conditions and ultimate collectability |
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | 7,642 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 7,039 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = hbnc_MortgageServicingRightsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Valuation Technique | Discounted cashflows |
Valuation Technique | Discounted cashflows |
Unobservable Inputs | Discount rate, Constant prepayment rate, Probably of default |
Unobservable Inputs | Discount rate, Constant prepayment rate, Probably of default |
Minimum [Member] | Significant Unobservable Inputs (Level 3) [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] | Significant Unobservable Inputs (Level 3) [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] | Significant Unobservable Inputs (Level 3) [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] | Significant Unobservable Inputs (Level 3) [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] | Significant Unobservable Inputs (Level 3) [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] | Significant Unobservable Inputs (Level 3) [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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- Definition Discount to reflect current market conditions and ultimate collectability. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs recurring and nonrecurring basis excluding goodwill. + References No definition available. + Details
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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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- 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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition 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 -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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