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

X

- Definition

Capitalized mortgage servicing rights.

+ References

No definition available.

+ Details

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X

- Definition

Finite lived 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

X

- Definition

Finite lived mortgage servicing rights net of impairment.

+ References

No definition available.

+ Details

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X

- Definition

Mortgage servicing rights additions.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Mortgage servicing rights impairment allowance.

+ References

No definition available.

+ Details

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X

- Definition

Mortgage servicing rights reductions.

+ References

No definition available.

+ Details

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X

- 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

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