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Accounting for Certain Loans Acquired in a Transfer - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Total provision charged to operating expense | $ 978,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 1,741,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 339,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ (997,000)us-gaap_ProvisionForLoanAndLeaseLosses | $ 104,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 729,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 2,084,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 3,058,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 1,920,000 us-gaap_ProvisionForLoanAndLeaseLosses | $ 3,524,000 us-gaap_ProvisionForLoanAndLeaseLosses
Loans Purchased With Evidence Of Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Total provision charged to operating expense |  |  |  |  |  |  |  | 253,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember | 2,600,000 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember |
Allowances for loan losses |  |  |  |  |  |  |  | $ 283,000 hbnc_ReversalOfAllowanceForLoanReceivable / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember | $ 0 hbnc_ReversalOfAllowanceForLoanReceivable / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember |

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- Definition Reversal of allowance for loan receivable. + References No definition available. + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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