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Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions	Jul. 12, 2016	Mar. 31, 2016	Oct. 04, 2016	Sep. 30, 2016
First Farmers Bank And Trust Co [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Business acquisition, loans assumed			$ 5.0
Business acquisition, deposits assumed			$ 15.0
Central National Bank & Trust [Member]
Subsequent Event [Line Items]
Percentage of cash consideration received as capital in excess of assets	8.00%
Percentage of cash consideration received from parent as percentage of remaining capital	120.00%
Cash consideration received as special dividend		$ 6.7
Payments received as cash consideration		$ 5.3
Reported total assets of acquiree				$ 56.4

X

- Definition

Business combination percentage of cash consideration received as capital in excess of assets.

+ References

No definition available.

+ Details

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X

- Definition

Business combination rate of cash consideration received from parent as percentage of remaining capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbnc_
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X

- Definition

Business combination recognized identifiable assets acquired and liabilities assumed deposits.

+ References

No definition available.

+ Details

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

X

- Definition

Business combination recognized identifiable assets acquired and liabilities assumed loans.

+ References

No definition available.

+ Details

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X

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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X

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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