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Loans - Amounts of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total $ 674,314us-gaap_LoansAndLeasesReceivableCommercial $ 505,189us-gaap_LoansAndLeasesReceivableCommercial    
Real Estate, Total 254,625hbnc_LoansReceivableRealEstate 185,958hbnc_LoansReceivableRealEstate    
Consumer, Total 320,459us-gaap_LoansAndLeasesReceivableConsumer 279,525us-gaap_LoansAndLeasesReceivableConsumer    
Mortgage warehouse 129,156us-gaap_LoansReceivableMortgageWarehouseLending 98,156us-gaap_LoansReceivableMortgageWarehouseLending    
Total loans 1,378,554us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 1,068,828us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Allowance for loan losses (16,501)us-gaap_LoansAndLeasesReceivableAllowance (15,992)us-gaap_LoansAndLeasesReceivableAllowance (18,270)us-gaap_LoansAndLeasesReceivableAllowance (18,882)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 1,362,053hbnc_LoansNetOfAllowanceForLoanLosses 1,052,836hbnc_LoansNetOfAllowanceForLoanLosses    
Working Capital and Equipment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 300,940us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_WorkingCapitalAndEquipmentMember
241,569us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_WorkingCapitalAndEquipmentMember
   
Real Estate Including Agriculture [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 343,455us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateIncludingAgricultureMember
245,313us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateIncludingAgricultureMember
   
Tax Exempt Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 8,595us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_TaxExemptLoansReceivableMember
2,898us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_TaxExemptLoansReceivableMember
   
Other Commercial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial, Total 21,324us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherCommercialLoansMember
15,409us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherCommercialLoansMember
   
1-4 Family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 250,799hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OneToFourFamilyMember
181,393hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OneToFourFamilyMember
   
Other Real Estate Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real Estate, Total 3,826hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherRealEstateLoansMember
4,565hbnc_LoansReceivableRealEstate
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherRealEstateLoansMember
   
Recreation Consumer Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 5,673us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RecreationConsumerLoansReceivableMember
4,839us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RecreationConsumerLoansReceivableMember
   
Real Estate Home Improvement Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 38,288us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateHomeImprovementLoansReceivableMember
30,729us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_RealEstateHomeImprovementLoansReceivableMember
   
Home Equity [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 112,426us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
96,924us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Other Consumer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 5,921us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherConsumerLoansMember
3,293us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancialInstrumentAxis
= hbnc_OtherConsumerLoansMember
   
Consumer Loans Auto Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total 154,538us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
139,915us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Unsecured Debt [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer, Total $ 3,613us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 3,825us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember