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Acquisition - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Apr. 03, 2014
Business Acquisition [Line Items]
Common stock outstanding	9,232,163us-gaap_CommonStockSharesOutstanding	9,213,036us-gaap_CommonStockSharesOutstanding
Net intangible assets acquired			$ 822,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Acquisition of goodwill	28,176,000us-gaap_Goodwill	28,176,000us-gaap_Goodwill	8,428,000us-gaap_Goodwill
Purchase price of the business assets			2,548,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
Summit [Member]
Business Acquisition [Line Items]
Date of acquisition agreement	Apr. 03, 2014
Exchange ratio per share			49.04%hbnc_ExchangeRatioPerShare / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Share of common stock outstanding per share			$ 5.15hbnc_BusinessCombinationMergerConsiderationPricePerShare / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Common stock outstanding			1,164,442us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Common stock issued	570,820us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Market closing price per share			$ 22.23us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Transaction value is estimated			18,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Costs related to the acquisition	1,300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Net tangible assets acquired			19,900,000hbnc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Net intangible assets acquired			822,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Acquisition of goodwill			8,400,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Purchase price of the business assets			4,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Core deposit intangible amortization period	7 years
Loan portfolio acquired			130,500,000hbnc_BusinessAcquisitionPurchasePriceAllocationLoanPortfolioAmount / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Discount on loan portfolio acquired			6,400,000hbnc_DiscountOnLoanPortfolioAcquired / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Performing portion of the loan portfolio acquired			106,200,000hbnc_PerformingPortionOfLoanPortfolioAcquired / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember
Estimated fair value of performing portion of the loan portfolio			$ 104,600,000hbnc_EstimatedFairValueOfPerformingPortionOfLoanPortfolio / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember

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Loan portfolio acquired.

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Business Combination Merger Consideration Price Per Share

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Discount on loan portfolio acquired.

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Estimated fair value of performing portion of the loan portfolio.

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Performing portion of the loan portfolio acquired.

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Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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Number of shares of equity interests issued or issuable to acquire entity.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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