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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 | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 6,098 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis | $ 3,643 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
Amortized cost one to five years | 44,720 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis | 49,198 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
Amortized cost for five to ten years | 16,147 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis | 106,225 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
Amortized cost for after ten years | 6,598 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis | 62,120 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
Total amortized cost | 73,563 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 221,186 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Total available for sale investment securities, Amortized Cost | 319,746 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 508,427 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Within one year, amortized cost |  | 9,910 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
One to five years, amortized cost | 592 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount |
Five to ten years, amortized cost | 99,225 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount |
After ten years, amortized cost | 39,582 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |
Total amortized cost | 139,399 hbnc_HeldToMaturitySecuritiesDebtMaturitiesAmortizedCost | 9,910 hbnc_HeldToMaturitySecuritiesDebtMaturitiesAmortizedCost
Total held to maturity investment securities, amortized cost | 165,767 us-gaap_HeldToMaturitySecurities | 9,910 us-gaap_HeldToMaturitySecurities
Fair value within one year | 6,169 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue | 3,663 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
Fair value for one to five years | 45,093 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue | 49,627 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
Fair value for five to ten years | 16,768 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue | 107,424 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
Fair value for after ten years | 6,790 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue | 61,051 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
Total fair value | 74,820 hbnc_AvailableForSaleSecuritiesDebtMaturitiesRollingFairValue | 221,765 hbnc_AvailableForSaleSecuritiesDebtMaturitiesRollingFairValue
Investment securities, available for sale | 323,764 us-gaap_AvailableForSaleSecurities | 508,591 us-gaap_AvailableForSaleSecurities
Within one year, fair value |  | 9,910 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
One to five years, fair value | 593 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue |
five to ten years, fair value | 101,323 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue |
After ten years, fair value | 40,857 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue |
Total fair value | 142,773 hbnc_HeldToMaturitySecuritiesDebtMaturitiesFairValueAggregate | 9,910 hbnc_HeldToMaturitySecuritiesDebtMaturitiesFairValueAggregate
Held-to-maturity, Fair Value | 169,904 us-gaap_HeldToMaturitySecuritiesFairValue | 9,910 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 | 122,930 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember | 116,047 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember
Total held to maturity investment securities, amortized cost | 4,039 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember |
Investment securities, available for sale | 122,860 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember | 114,706 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = hbnc_FederalAgencyCollateralizedMortgageObligationsMember
Held-to-maturity, Fair Value | 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 | 122,583 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 170,006 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total held to maturity investment securities, amortized cost | 22,329 us-gaap_HeldToMaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Investment securities, available for sale | 125,395 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 170,894 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity, Fair Value | 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 | 1,188 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Investment securities, available for sale | $ 689 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | $ 1,226 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember

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