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

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