Commitments, Off-Balance Sheet Risk and Contingencies (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments to make loans	$ 917.4	$ 958.7
Commitments under outstanding standby letters of credit	$ 12.4	$ 17.3

Commitments under outstanding standby letters of credit.

No definition available.

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