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Employee Stock Ownership Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Eligible compensation for ESOP	$ 265,000
Cash contributions and expense recorded for the ESOP	$ 750,000	$ 600,000	$ 550,000
Employee stock ownership plan outstanding shares	1,376,821
Percentage of outstanding shares	3.60%

X

- Definition

Employee stock ownership plan ESOP cash contribution and compensation expenses.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of entity outstanding share held in employee stock ownership plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbnc_
Data Type:	num:percentItemType
Balance Type:	na
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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X

- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929

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