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Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total cost $ 79,411us-gaap_PropertyPlantAndEquipmentGross $ 70,622us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (26,950)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (24,428)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net premise and equipment 52,461us-gaap_PropertyPlantAndEquipmentNet 46,194us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 16,550us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
13,323us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 49,066us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
45,466us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 13,795us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hbnc_FurnitureAndEquipmentMember
$ 11,833us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hbnc_FurnitureAndEquipmentMember