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Acquisition - Additional Information (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Apr. 03, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Common stock outstanding | 9,213,036 us-gaap_CommonStockSharesOutstanding |  | 8,630,966 us-gaap_CommonStockSharesOutstanding
Net intangible assets acquired |  | $ 822,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill |
Acquisition of goodwill | 28,176,000 us-gaap_Goodwill | 8,428,000 us-gaap_Goodwill | 19,748,000 us-gaap_Goodwill
Purchase price of the business assets |  | 2,548,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |
Summit [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date of acquisition agreement | Apr. 03, 2014 |  |
Exchange ratio per share to Heartland shareholder |  | 49.04%hbnc_ExchangeRatioPerShare / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Share of common stock outstanding per share |  | $ 5.15 hbnc_BusinessCombinationMergerConsiderationPricePerShare / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Common stock outstanding |  | 1,164,442 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Common stock issued | 570,820 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |  |
Market closing price per share |  | $ 22.23 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Transaction value is estimated |  | 18,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Costs related to the acquisition | 1,300,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |  |
Net tangible assets acquired |  | 19,900,000 hbnc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Net intangible assets acquired |  | 822,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Acquisition of goodwill |  | 8,400,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Purchase price of the business assets |  | 4,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Core deposit intangible amortization period | 7 years |  |
Loan portfolio acquired |  | 130,500,000 hbnc_BusinessAcquisitionPurchasePriceAllocationLoanPortfolioAmount / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Discount on loan portfolio acquired |  | 6,400,000 hbnc_DiscountOnLoanPortfolioAcquired / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Performing portion of the loan portfolio acquired |  | 106,200,000 hbnc_PerformingPortionOfLoanPortfolioAcquired / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |
Estimated fair value of performing portion of the loan portfolio |  | $ 104,600,000 hbnc_EstimatedFairValueOfPerformingPortionOfLoanPortfolio / us-gaap_BusinessAcquisitionAxis = hbnc_SummitMember |

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- Definition Estimated fair value of performing portion of the loan portfolio. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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