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Loan Servicing - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Unpaid principal balances of loans serviced for others totaled $ 1,035,500,000hbnc_PrincipalAmountOfServiceLoanOutstanding $ 943,100,000hbnc_PrincipalAmountOfServiceLoanOutstanding  
Aggregate fair value of capitalized mortgage servicing rights 10,500,000hbnc_CapitalizedMortgageServiceRightFairValue 9,900,000hbnc_CapitalizedMortgageServiceRightFairValue 6,600,000hbnc_CapitalizedMortgageServiceRightFairValue
Mortgage servicing rights, net 7,642,000hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment 7,039,000hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment 5,145,000hbnc_FiniteLivedMortgageServicingRightsNetOfImpairment
Bank recorded additional (impairment) $ 51,000us-gaap_MortgageServicingRightsMSRImpairmentRecovery $ 635,000us-gaap_MortgageServicingRightsMSRImpairmentRecovery $ (168,000)us-gaap_MortgageServicingRightsMSRImpairmentRecovery