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Commitments, Off Balance Sheets Risk and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
Cash on hand or deposit with Federal Reserve Bank $ 2,300,000us-gaap_CashReserveDepositRequiredAndMade  
Commitments to make loans 408,600,000hbnc_CommitmentToMakeLoanByCompany 519,700,000hbnc_CommitmentToMakeLoanByCompany
Commitments under outstanding standby letters of credit 3,900,000hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit 1,300,000hbnc_CommitmentsUnderOutstandingStandbyLettersOfCredit
Anticipated losses from unused commitments $ 0hbnc_AnticipatedLossesFromUnusedCommitments