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Cash Equivalents - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Cash and Cash Equivalents [Abstract]
Cash equivalent maximum maturity period	3 months
Increase in Cash account over the insured limit	$ 12.5

X

- Definition

Cash amount exceed over FDIC insured limit.

+ References

No definition available.

+ Details

Name:	hbnc_CashCashEquivalentsInExcessOfFdicInsuredLimits
Namespace Prefix:	hbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash equivalent maximum maturity period.

+ References

No definition available.

+ Details

Name:	hbnc_CashEquivalentMaximumMaturityPeriod
Namespace Prefix:	hbnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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