XML 78 R68.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
LIBOR period | 3 months |
Weighted average fixed rate | 5.81% |
Recorded period of effectiveness of cash flow hedges on net income | 12 months |
Recorded period of effectiveness of fair value hedges on net income | 12 months |
Recorded period of effectiveness of fair value of derivatives on net income | 12 months |
LaPorte Bancorp Inc [Member] |  |
Derivative [Line Items] |  |
LIBOR period | 1 month |
Weighted average fixed rate | 2.31% |
Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | $ 30.5 | $ 30.5
Cash Flow Hedging [Member] | LaPorte Bancorp Inc [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | 30.0 | 30.0
Derivative in Fair Value Hedging Relationship [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | $ 155.7 | $ 154.6

X
- Definition Cash flow hedge derivatives expected period of insignificant impact on net income. + References No definition available. + Details
Name: | hbnc_CashFlowHedgeDerivativesExpectedPeriodOfInsignificantImpactOnNetIncome
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair flow hedge derivatives expected period of insignificant impact on net income. + References No definition available. + Details
Name: | hbnc_FairFlowHedgeDerivativesExpectedPeriodOfInsignificantImpactOnNetIncome
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition LIBOR period. + References No definition available. + Details
Name: | hbnc_LiborPeriod
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Non designated hedge derivatives expected period of insignificant impact on net income. + References No definition available. + Details
Name: | hbnc_NonDesignatedHedgeDerivativesExpectedPeriodOfInsignificantImpactOnNetIncome
Namespace Prefix: | hbnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=hbnc_LaporteBancorpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |