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Loans - Amounts of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total $ 695,736us-gaap_LoansAndLeasesReceivableCommercial $ 674,314us-gaap_LoansAndLeasesReceivableCommercial    
Real Estate, Total 260,390hbnc_LoansReceivableRealEstate 254,625hbnc_LoansReceivableRealEstate    
Consumer, Total 326,334us-gaap_LoansAndLeasesReceivableConsumer 320,459us-gaap_LoansAndLeasesReceivableConsumer    
Mortgage warehouse 178,899us-gaap_LoansReceivableMortgageWarehouseLending 129,156us-gaap_LoansReceivableMortgageWarehouseLending    
Total loans 1,461,359us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 1,378,554us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Allowance for loan losses (16,634)us-gaap_LoansAndLeasesReceivableAllowance (16,501)us-gaap_LoansAndLeasesReceivableAllowance (16,102)us-gaap_LoansAndLeasesReceivableAllowance (15,992)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 1,444,725hbnc_LoansNetOfAllowanceForLoanLosses 1,362,053hbnc_LoansNetOfAllowanceForLoanLosses    
Working Capital and Equipment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 311,789us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_WorkingCapitalAndEquipmentMember
300,940us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_WorkingCapitalAndEquipmentMember
   
Real Estate Including Agriculture [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 354,356us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateIncludingAgricultureMember
343,455us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateIncludingAgricultureMember
   
Tax Exempt Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 8,890us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_TaxExemptLoansReceivableMember
8,595us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_TaxExemptLoansReceivableMember
   
Other Commercial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 20,701us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherCommercialLoansMember
21,324us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherCommercialLoansMember
   
1-4 Family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 256,809hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OneToFourFamilyMember
250,799hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OneToFourFamilyMember
   
Other Real Estate Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 3,581hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherRealEstateLoansMember
3,826hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherRealEstateLoansMember
   
Recreation Consumer Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 5,645us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RecreationConsumerLoansReceivableMember
5,673us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RecreationConsumerLoansReceivableMember
   
Real Estate Home Improvement Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 38,371us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateHomeImprovementLoansReceivableMember
38,288us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateHomeImprovementLoansReceivableMember
   
Home Equity [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 112,180us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
112,426us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Other Consumer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 6,033us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherConsumerLoansMember
5,921us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherConsumerLoansMember
   
Consumer Loans Auto Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 160,668us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
154,538us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Unsecured Debt [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total $ 3,437us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 3,613us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember