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Loan Servicing - Originated Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Payments for (Proceeds from) Mortgage Servicing Rights [Abstract] |  |  |
Balances, January 1 | $ 12,876 | $ 12,189 | $ 11,681
Servicing rights capitalized | 3,547 | 1,883 | 2,109
Amortization of servicing rights | (1,377) | (1,196) | (1,601)
Balances, December 31 | 15,046 | 12,876 | 12,189
Balances, January 1 | (527) | (587) | (507)
Additions | (234) | (78) | (85)
Reductions | 42 | 138 | 5
Balances, December 31 | (719) | (527) | (587)
Mortgage servicing rights, net | $ 14,327 | $ 12,349 | $ 11,602

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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
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Namespace Prefix: | hbnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Mortgage servicing rights additions. + References No definition available. + Details
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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
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 + Details
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- References No definition available. + Details
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