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Securities - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Apr. 01, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 01, 2014 Security
Amortized Cost and Fair Value Debt Securities [Abstract]
Unrealized loss, other than temporary securities		$ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities
Number of securities					319hbnc_NumberOfAvailableForSaleSecuritiesTransfersToHeldToMaturity
Aggregate fair value of securities					167,100,000hbnc_AvailableForSaleSecuritiesTransfersToHeldToMaturityFairValue
Gain/Loss from net unrealized holdings, Net of tax	1,300,000us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Unrealized gain or loss, Held to maturity	0us-gaap_HeldToMaturitySecuritiesTransferredSecurityUnrealizedGainLoss
Tax effect of the proceeds from sale of securities		346us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss	131us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss	0us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
Pledged of Fair Value of Securities as collateral		159,700,000us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValue
Amortization cost of securities as Collateral not Separately Reported		157,400,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements
Debt Instrument Repurchase Agreement		139,700,000hbnc_DebtInstrumentRepurchaseAgreementCollateralAmount
Securities Pledged for Federal Home Loan Bank At Fair Value		94,300,000us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedForFederalHomeLoanBankAtFairValue
Securities for Federal Home Loan Bank Not Separately Reported		91,800,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
Securities Pledged For Derivative At Fair Value		13,000,000hbnc_PledgedAssetsSeparatelyReportedSecuritiesPledgedForDerivativeAtFairValue
Securities Pledged For Derivative At Amortized Cost		12,500,000hbnc_PledgedAssetsSeparatelyReportedSecuritiesPledgedForDerivativeValue
Debt Instrument Derivative Swap Agreement		4,500,000hbnc_DebtInstrumentDerivativeSwapAgreementCollateralAmount
Debt Instrument Federal Home Loan Bank		$ 0hbnc_DebtInstrumentFederalHomeLoanBankCollateralAmount

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- Definition

Available for sale securities transfers to held to maturity fair value.

+ References

No definition available.

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- Definition

Debt instrument derivative swap agreement collateral amount.

+ References

No definition available.

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- Definition

Debt instrument federal home loan bank collateral amount.

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- Definition

Debt instrument repurchase agreement collateral amount.

+ References

No definition available.

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- Definition

Number of available for sale securities transfers to held to maturity.

+ References

No definition available.

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- Definition

Pledged assets separately reported securities pledged for derivative at fair value.

+ References

No definition available.

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- Definition

Pledged assets separately reported securities pledged for derivative value.

+ References

No definition available.

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- Definition

Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

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- Definition

The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 20

-Section 45

-Paragraph 11

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324

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- Definition

This item represents the unrealized gain (loss) related to held-to-maturity securities transferred to another category of investments in debt and equity securities (trading or available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563

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- Definition

The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of the FHLB debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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- Definition

The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

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- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

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