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Loan Servicing - Originated Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Payments for (Proceeds from) Mortgage Servicing Rights [Abstract] |  |  |
Balances, January 1 | $ 7,428 hbnc_FiniteLivedMortgageServicingRights | $ 6,169 hbnc_FiniteLivedMortgageServicingRights | $ 5,049 hbnc_FiniteLivedMortgageServicingRights
Servicing rights capitalized | 2,280 hbnc_CapitalizedMortgageServicingRights | 2,535 hbnc_CapitalizedMortgageServicingRights | 2,439 hbnc_CapitalizedMortgageServicingRights
Amortization of servicing rights | (1,728)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (1,276)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (1,319)us-gaap_AmortizationOfMortgageServicingRightsMSRs
Balances, December 31 | 7,980 hbnc_FiniteLivedMortgageServicingRights | 7,428 hbnc_FiniteLivedMortgageServicingRights | 6,169 hbnc_FiniteLivedMortgageServicingRights
Balances, January 1 | (389)hbnc_MortgageServicingRightsImpairmentAllowance | (1,024)hbnc_MortgageServicingRightsImpairmentAllowance | (856)hbnc_MortgageServicingRightsImpairmentAllowance
Additions | (95)hbnc_MortgageServicingRightsAdditions | (54)hbnc_MortgageServicingRightsAdditions | (762)hbnc_MortgageServicingRightsAdditions
Reductions | 146 hbnc_MortgageServicingRightsReductions | 689 hbnc_MortgageServicingRightsReductions | 594 hbnc_MortgageServicingRightsReductions
Balances, December 31 | (338)hbnc_MortgageServicingRightsImpairmentAllowance | (389)hbnc_MortgageServicingRightsImpairmentAllowance | (1,024)hbnc_MortgageServicingRightsImpairmentAllowance
Mortgage servicing rights, net | $ 7,642 hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment | $ 7,039 hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment | $ 5,145 hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment

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- Definition Capitalized mortgage servicing rights. + References No definition available. + Details
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Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finite lived mortgage servicing rights. + References No definition available. + Details
Name: | hbnc_FiniteLivedMortgageServicingRights
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finite lived mortgage servicing rights net of impairment. + References No definition available. + Details
Name: | hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Mortgage servicing rights additions. + References No definition available. + Details
Name: | hbnc_MortgageServicingRightsAdditions
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Mortgage servicing rights impairment allowance. + References No definition available. + Details
Name: | hbnc_MortgageServicingRightsImpairmentAllowance
Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Mortgage servicing rights reductions. + References No definition available. + Details
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Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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