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Non-performing Assets and Impaired Loans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Contract
ConsecutivePayment
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Non-accrual loans $ 15,312,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 9,748,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Non-performing TDRs 2,600,000hbnc_FinancingReceivableModificationsTroubleDebtRestructuringRecordedAsNonPerformingLoan  
Loans acquired included in non-accrual loans 1,400,000hbnc_FinancingReceivableLoanAcquiredRecordedAsNonAccrualLoan  
Loans acquired included in non-performing TDRs 247,000hbnc_FinancingReceivableLoanAcquiredRecordedAsNonPerformingLoan  
Loan delinquency period 90 days  
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status 6 months  
Restructured loans with modified recorded balances 0hbnc_FinancingReceivableModificationsRecordedInvestmentOfRestructuredLoans  
Restructured loan returned to accruing status number of Consecutive Payments of loan 6hbnc_NumberOfConsecutivePaymentsOfLoanRestructured  
Restructured loan reported in TDRs 7,000,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Specific reserves allocated to troubled debt restructuring 1,000,000hbnc_SpecificReservesAllocatedToTroubledDebtRestructuring  
Number TDRs returned to accrual status 3hbnc_AccrualStatusTroubledDebtRestructuringNumberOfContracts  
Total balances of TDR's 288,000hbnc_AccrualTroubledDebtRestructuring  
Loans classified as TDR after a period 90 days  
Good Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating 5 years  
Number of years of Satisfactory Relationship with bank for Good Pass Rating 5 years  
Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
Restructured loan 4,400,000us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		  
Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Loan delinquency period 90 days  
Delay or shortfall in payments of loan 30 days  
Loans with an aggregate credit exposure 1,000,000hbnc_LoansWithAggregateCreditExposure
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Minimum [Member] | Good Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Number of consecutive years of profit for Good Pass Rating 3 years  
Minimum [Member] | Satisfactory Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating 2 years  
Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Loans with an aggregate credit exposure $ 2,500,000hbnc_LoansWithAggregateCreditExposure
/ us-gaap_RangeAxis
= us-gaap_MaximumMember