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Income Tax - Reconciliation of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Currently payable
Federal	$ 4,710us-gaap_CurrentFederalTaxExpenseBenefit	$ 3,900us-gaap_CurrentFederalTaxExpenseBenefit	$ 5,582us-gaap_CurrentFederalTaxExpenseBenefit
State	(149)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	(88)us-gaap_CurrentStateAndLocalTaxExpenseBenefit	120us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred	1,594us-gaap_DeferredIncomeTaxExpenseBenefit	3,236us-gaap_DeferredIncomeTaxExpenseBenefit	2,744us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	6,155us-gaap_IncomeTaxExpenseBenefit	7,048us-gaap_IncomeTaxExpenseBenefit	8,446us-gaap_IncomeTaxExpenseBenefit
Reconciliation of federal statutory to actual tax expense
Federal statutory income tax at 35%	8,488us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9,424us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9,800us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax exempt interest	(1,628)hbnc_IncomeTaxReconciliationTaxExemptInterestIncome	(1,517)hbnc_IncomeTaxReconciliationTaxExemptInterestIncome	(1,419)hbnc_IncomeTaxReconciliationTaxExemptInterestIncome
Tax exempt income	(366)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(362)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(359)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Other tax exempt income	(309)us-gaap_IncomeTaxReconciliationOtherAdjustments	(342)us-gaap_IncomeTaxReconciliationOtherAdjustments
Nondeductible and other	(30)hbnc_IncomeTaxReconciliationNondeductibleExpenseAndOther	(176)hbnc_IncomeTaxReconciliationNondeductibleExpenseAndOther	(177)hbnc_IncomeTaxReconciliationNondeductibleExpenseAndOther
Effect of state income taxes		21us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	601us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Total income tax expense	$ 6,155us-gaap_IncomeTaxExpenseBenefit	$ 7,048us-gaap_IncomeTaxExpenseBenefit	$ 8,446us-gaap_IncomeTaxExpenseBenefit

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