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Loan Servicing - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Payments for (Proceeds from) Mortgage Servicing Rights [Abstract]
Unpaid principal balances of loans serviced for others totaled	$ 1,460	$ 1,479

X

- Definition

Principal amount of service loan outstanding.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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