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Loans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Period of loan sold	30 days
Minimum period seldom held	90 days
Mortgage warehousing maximum pay off period	30 days

X

- Definition

Minimum period seldom held.

+ References

No definition available.

+ Details

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

X

- Definition

Mortgage warehousing maximum pay off period.

+ References

No definition available.

+ Details

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

X

- Definition

Period of loan sold by mortgage company.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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