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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 1,378,554us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 1,068,828us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Carrying amount, net of allowance 1,360,971us-gaap_LoansAndLeasesReceivableNetReportedAmount 1,051,943us-gaap_LoansAndLeasesReceivableNetReportedAmount
Loans Purchased With Evidence Of Credit Deterioration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 136,487us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
60,294us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Carrying amount, net of allowance 136,128us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
59,905us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 84,678us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
37,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 34,387us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
11,761us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 17,422us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
11,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 36,488us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
60,294us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 18,307us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
37,048us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 9,734us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
11,761us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 8,447us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
11,485us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_HeartlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 99,999us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_SummitMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
 
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 66,371us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_SummitMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
 
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 24,653us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_SummitMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember
 
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 8,975us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_BusinessAcquisitionAxis
= hbnc_SummitMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis
= us-gaap_CreditRiskMember