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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 6,170 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis | $ 6,098 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
Amortized cost one to five years | 49,096 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis | 44,720 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
Amortized cost for five to ten years | 16,830 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis | 16,147 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
Amortized cost for after ten years | 6,372 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis | 6,598 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
Total amortized cost | 78,468 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 73,563 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Total available for sale investment securities, Amortized Cost | 325,176 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 319,746 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Within one year, amortized cost | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
One to five years, amortized cost | 1,223 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount | 592 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Five to ten years, amortized cost | 104,305 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount | 99,225 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
After ten years, amortized cost | 32,854 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount | 39,582 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Total amortized cost | 138,382 hbnc_HeldToMaturitySecuritiesDebtMaturitiesAmortizedCost | 139,399 hbnc_HeldToMaturitySecuritiesDebtMaturitiesAmortizedCost
Total held to maturity investment securities, amortized cost | 164,282 us-gaap_HeldToMaturitySecurities | 165,767 us-gaap_HeldToMaturitySecurities
Fair value within one year | 6,220 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue | 6,169 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
Fair value for one to five years | 49,902 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue | 45,093 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
Fair value for five to ten years | 17,373 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue | 16,768 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
Fair value for after ten years | 6,552 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue | 6,790 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
Total fair value | 80,047 hbnc_AvailableForSaleSecuritiesDebtMaturitiesRollingFairValue | 74,820 hbnc_AvailableForSaleSecuritiesDebtMaturitiesRollingFairValue
Investment securities, available for sale | 331,033 us-gaap_AvailableForSaleSecurities | 323,764 us-gaap_AvailableForSaleSecurities
Within one year, fair value | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
One to five years, fair value | 1,243 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue | 593 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
five to ten years, fair value | 109,391 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue | 101,323 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
After ten years, fair value | 33,941 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue | 40,857 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue
Total fair value | 144,575 hbnc_HeldToMaturitySecuritiesDebtMaturitiesFairValueAggregate | 142,773 hbnc_HeldToMaturitySecuritiesDebtMaturitiesFairValueAggregate
Held-to-maturity, Fair Value | 171,405 us-gaap_HeldToMaturitySecuritiesFairValue | 169,904 us-gaap_HeldToMaturitySecuritiesFairValue
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 120,785 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember | 122,930 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember
Total held to maturity investment securities, amortized cost | 3,873 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember | 4,039 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember
Investment securities, available for sale | 121,719 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember | 122,860 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember
Held-to-maturity, Fair Value | 3,918 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember | 4,073 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 125,923 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 122,583 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total held to maturity investment securities, amortized cost | 22,027 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 22,329 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Investment securities, available for sale | 129,267 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 125,395 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity, Fair Value | 22,912 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 23,058 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost |  | 670 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Investment securities, available for sale |  | $ 689 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember

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