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Business Combination - Additional Information (Detail) (USD $)
0 Months Ended
Feb. 18, 2015
Apr. 03, 2014
Dec. 31, 2014
Business Combination Transactions [Line Items]      
Reported total assets of acquiree   $ 158,585,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets  
Total deposits held by acquiree   138,660,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities  
Peoples Bancorp Inc [Member]      
Business Combination Transactions [Line Items]      
Reported total assets of acquiree     486,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
Total deposits held by acquiree     368,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
Total loans of acquiree     235,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
Peoples Bancorp Inc [Member] | Subsequent Event [Member]      
Business Combination Transactions [Line Items]      
Exchange ratio per share to Peoples shareholder 95.00%hbnc_ExchangeRatioPerShare
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Cash paid for each share to Peoples shareholder $ 9.75hbnc_CashPaidPerShareBusinessCombination
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Market closing price per share $ 23.02us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Estimated transaction value $ 73,100,000hbnc_BusinessAcquisitionCostOfAcquiredEntityEstimatedPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= hbnc_PeoplesBancorpIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember