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Non-performing Loans and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Defaults	Mar. 31, 2014 Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults	2us-gaap_FinancingReceivableModificationsNumberOfContracts2	3us-gaap_FinancingReceivableModificationsNumberOfContracts2
Unpaid Principal Balance	$ 34us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 544us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Unpaid Principal Balance	2us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember	398us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = hbnc_OwnerOccupiedRealEstateMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Unpaid Principal Balance	2us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = hbnc_OwnerOccupiedRealEstateMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults		2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = hbnc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Unpaid Principal Balance		398us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = hbnc_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Unpaid Principal Balance	32us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	146us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Consumer [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Unpaid Principal Balance	$ 32us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember	$ 146us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember

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- Definition

Number of 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 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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