Disclosures about fair value of assets and liabilities (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount rate	10.00%
Level 3 [Member] \| Impaired Loans [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Fair Value at December 31, 2012	8,652
Valuation Technique	Collateral based measurement
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability
Level 3 [Member] \| Mortgage Servicing Rights [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Fair Value at December 31, 2012	5,145
Valuation Technique	Discounted cashflows
Unobservable Inputs	Discount rate, Constant prepayment rate, Probably of default
Level 3 [Member] \| Maximum [Member] \| Impaired Loans [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount to reflect current market conditions and ultimate collectability	15.00%
Level 3 [Member] \| Maximum [Member] \| Mortgage Servicing Rights [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount rate	15.00%
Constant prepayment rate	7.00%
Probably of default	10.00%
Level 3 [Member] \| Minimum [Member] \| Impaired Loans [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount to reflect current market conditions and ultimate collectability	10.00%
Level 3 [Member] \| Minimum [Member] \| Mortgage Servicing Rights [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount rate	10.00%
Constant prepayment rate	4.00%
Probably of default	1.00%
Level 3 [Member] \| Weighted Average [Member] \| Impaired Loans [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount to reflect current market conditions and ultimate collectability	12.00%
Level 3 [Member] \| Weighted Average [Member] \| Mortgage Servicing Rights [Member]
Qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill
Discount rate	12.00%
Constant prepayment rate	4.60%
Probably of default	4.50%

Discount to reflect current market conditions and ultimate collectability.

No definition available.

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Namespace Prefix:	hbnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value measurement with unobservable inputs recurring and nonrecurring basis excluding goodwill.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbnc_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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Namespace Prefix:	hbnc_
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Period Type:	duration

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration