Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 13,282	$ 15,312
Loans Past Due Over 90 Days Still Accruing	19	115
Non-Performing TDRs	4,711	2,643
Performing TDRs	4,368hbnc_PerformingTroubledDebtRestructured	4,372hbnc_PerformingTroubledDebtRestructured
Total Non-Performing Loans	22,380hbnc_AggregateNonPerformingLoans	22,442hbnc_AggregateNonPerformingLoans
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7,576	10,024
Non-Performing TDRs	3,363	1,221
Performing TDRs	601	610
Total Non-Performing Loans	11,540	11,855
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,452	1,773
Performing TDRs	41	44
Total Non-Performing Loans	1,493	1,817
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	5,558	7,439
Non-Performing TDRs	2,378	217
Performing TDRs	560	566
Total Non-Performing Loans	8,496	8,222
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	566	812
Non-Performing TDRs	985	1,004
Total Non-Performing Loans	1,551	1,816
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,547	2,297
Loans Past Due Over 90 Days Still Accruing		40
Non-Performing TDRs	1,009	1,031
Performing TDRs	2,506	2,526
Total Non-Performing Loans	6,062	5,894
Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,547	2,297
Loans Past Due Over 90 Days Still Accruing		40
Non-Performing TDRs	748	765
Performing TDRs	2,506	2,526
Total Non-Performing Loans	5,801	5,628
Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Performing TDRs	261	266
Total Non-Performing Loans	261	266
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	3,159	2,991
Loans Past Due Over 90 Days Still Accruing	19	75
Non-Performing TDRs	339	391
Performing TDRs	1,261	1,236
Total Non-Performing Loans	4,778	4,693
Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	334	227
Loans Past Due Over 90 Days Still Accruing		10
Total Non-Performing Loans	334	237
Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	506	557
Loans Past Due Over 90 Days Still Accruing	19	47
Total Non-Performing Loans	525	604
Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,319	2,207
Loans Past Due Over 90 Days Still Accruing		18
Non-Performing TDRs	339	391
Performing TDRs	1,261	1,236
Total Non-Performing Loans	$ 3,919	$ 3,852

Non-performing Loans and Impaired Loans - Non-accrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified