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Non-performing Loans and Impaired Loans - Additional Information (Detail) (USD $) | 3 Months Ended |
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Mar. 31, 2015 Contract ConsecutivePayment | Dec. 31, 2014
Financing Receivable, Modifications [Line Items] |  |
Non-accrual loans | $ 13,282,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | $ 15,312,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Non-performing TDRs | 4,700,000 hbnc_FinancingReceivableModificationsTroubleDebtRestructuringRecordedAsNonPerformingLoan |
Loans acquired included in non-accrual loans | 3,000,000 hbnc_FinancingReceivableLoanAcquiredRecordedAsNonAccrualLoan |
Loans acquired included in non-performing TDRs | 417,000 hbnc_FinancingReceivableLoanAcquiredRecordedAsNonPerformingLoan |
Loan delinquency period | 90 days |
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status | 6 months |
Restructured loans with modified recorded balances | 0 hbnc_FinancingReceivableModificationsRecordedInvestmentOfRestructuredLoans |
Restructured loan returned to accruing status number of Consecutive Payments of loan | 6 hbnc_NumberOfConsecutivePaymentsOfLoanRestructured |
Restructured loan reported in TDRs | 9,100,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |
Specific reserves allocated to troubled debt restructuring | 994,000 hbnc_SpecificReservesAllocatedToTroubledDebtRestructuring |
Number TDRs returned to accrual status | 1 hbnc_AccrualStatusTroubledDebtRestructuringNumberOfContracts |
Loans classified as TDR after a period | 90 days |
Good Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating | 5 years |
Number of years of Satisfactory Relationship with bank for Good Pass Rating | 5 years |
Performing Financing Receivable [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Restructured loan | 4,400,000 us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember |
Minimum [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loan delinquency period | 90 days |
Delay or shortfall in payments of loan | 30 days |
Loans with an aggregate credit exposure | 1,000,000 hbnc_LoansWithAggregateCreditExposure / us-gaap_RangeAxis = us-gaap_MinimumMember |
Minimum [Member] | Good Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of consecutive years of profit for Good Pass Rating | 3 years |
Minimum [Member] | Satisfactory Pass [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating | 2 years |
Maximum [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Loans with an aggregate credit exposure | $ 2,500,000 hbnc_LoansWithAggregateCreditExposure / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Credit quality classification consecutive profit period loans supported financial information. + References No definition available. + Details
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- Definition Credit quality classification period satisfactory relationship with bank. + References No definition available. + Details
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- Definition Credit quality classification period satisfactory repayment. + References No definition available. + Details
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- Definition Delay Or Shortfall In Payments Of Loan Period + References No definition available. + Details
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- Definition Financing receivable loan acquired recorded as non accrual loan. + References No definition available. + Details
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- Definition Financing receivable loan acquired recorded as non performing loan. + References No definition available. + Details
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- Definition Financing receivable modifications recorded investment of restructured loans. + References No definition available. + Details
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- Definition Financing receivable modifications trouble debt restructuring recorded as non performing loan. + References No definition available. + Details
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- Definition Loans with an aggregate credit exposure. + References No definition available. + Details
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- Definition Specific reserves allocated to troubled debt restructuring. + References No definition available. + Details
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- Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Amount of restructured debt contingently payable based on the occurrence of future events or circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15765-112638 + Details
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