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Borrowings - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Federal Home Loan Bank advances are secured by first and second mortgage loans and mortgage warehouse loans	$ 354.2us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Maximum amount of outstanding agreements	144.3hbnc_SecuritiesSoldUnderAgreementsToRepurchaseMonthlyAverageOutstandingAmount	141.4hbnc_SecuritiesSoldUnderAgreementsToRepurchaseMonthlyAverageOutstandingAmount
Daily average amount of outstanding agreements	140.9hbnc_SecuritiesSoldUnderAgreementsToRepurchaseDailyAverageOutstanding	137.6hbnc_SecuritiesSoldUnderAgreementsToRepurchaseDailyAverageOutstanding
Maturity date	Sep. 13, 2020
Available credit lines with various money center banks	$ 301.4us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822



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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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

-Publisher FASB

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