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Accounting for Certain Loans Acquired in a Transfer - Additional Information (Detail) (Loans Purchased With Evidence Of Credit Deterioration [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Loans Purchased With Evidence Of Credit Deterioration [Member]
Business Acquisition [Line Items]
Allowances for loan losses	$ 105,000hbnc_ReversalOfAllowanceForLoanReceivable / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember	$ 0hbnc_ReversalOfAllowanceForLoanReceivable / us-gaap_ManagingRisksInherentInServicingAssetsAndServicingLiabilitiesByTypeOfRiskAxis = us-gaap_CreditRiskMember

X

- Definition

Reversal of allowance for loan receivable.

+ References

No definition available.

+ Details

Name:	hbnc_ReversalOfAllowanceForLoanReceivable
Namespace Prefix:	hbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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