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Commitments, Off-Balance Sheet Risk and Contingencies (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments to make loans	$ 1,300.0	$ 917.4
Commitments under outstanding standby letters of credit	$ 12.7	$ 12.4

X

- Definition

Commitment to make loan by company.

+ References

No definition available.

+ Details

Name:	hbnc_CommitmentToMakeLoanByCompany
Namespace Prefix:	hbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments under outstanding standby letters of credit.

+ References

No definition available.

+ Details

Name:	hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit
Namespace Prefix:	hbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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