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Loans - Additional Information (Details) $ in Millions	Sep. 30, 2020 USD ($)
Receivables [Abstract]
Paycheck protection program	$ 310.8
Deferred loan costs	$ (5.7)

X

- Definition

Deferred fees costs loans and leases

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Paycheck Protection Program

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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