Non-performing Assets and Impaired Loans - Nonaccrual, 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	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 15,312	$ 9,748
Loans Past Due Over 90 Days Still Accruing	115	49
Non-Performing TDRs	2,643	3,426
Performing TDRs	4,372hbnc_PerformingTroubledDebtRestructured	5,054hbnc_PerformingTroubledDebtRestructured
Total Non-Performing Loans	22,442hbnc_AggregateNonPerformingLoans	18,277hbnc_AggregateNonPerformingLoans
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	10,024	4,014
Loans Past Due Over 90 Days Still Accruing	0	45
Non-Performing TDRs	1,221	2,116
Performing TDRs	610	1,296
Total Non-Performing Loans	11,855	7,471
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,773	293
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	0	222
Performing TDRs	44	778
Total Non-Performing Loans	1,817	1,293
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	7,439	2,289
Loans Past Due Over 90 Days Still Accruing	0	45
Non-Performing TDRs	217	1,117
Performing TDRs	566	518
Total Non-Performing Loans	8,222	3,969
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	0
Performing TDRs	0
Total Non-Performing Loans	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	182
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	0
Performing TDRs	0
Total Non-Performing Loans	0	182
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	812	1,250
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	1,004	777
Performing TDRs	0
Total Non-Performing Loans	1,816	2,027
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,297	2,459
Loans Past Due Over 90 Days Still Accruing	40	2
Non-Performing TDRs	1,031	999
Performing TDRs	2,526	2,686
Total Non-Performing Loans	5,894	6,146
Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,297	2,459
Loans Past Due Over 90 Days Still Accruing	40	2
Non-Performing TDRs	765	719
Performing TDRs	2,526	2,686
Total Non-Performing Loans	5,628	5,866
Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	266	280
Performing TDRs	0
Total Non-Performing Loans	266	280
Real Estate [Member] \| Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	0
Performing TDRs	0
Total Non-Performing Loans	0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,991	3,275
Loans Past Due Over 90 Days Still Accruing	75	2
Non-Performing TDRs	391	311
Performing TDRs	1,236	1,072
Total Non-Performing Loans	4,693	4,660
Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	227	202
Loans Past Due Over 90 Days Still Accruing	10
Non-Performing TDRs	0
Performing TDRs	0
Total Non-Performing Loans	237	202
Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0
Loans Past Due Over 90 Days Still Accruing	0
Non-Performing TDRs	0
Performing TDRs	0
Total Non-Performing Loans	0
Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	557	531
Loans Past Due Over 90 Days Still Accruing	47	2
Non-Performing TDRs	0
Performing TDRs	0
Total Non-Performing Loans	604	533
Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,207	2,542
Loans Past Due Over 90 Days Still Accruing	18
Non-Performing TDRs	391	311
Performing TDRs	1,236	1,072
Total Non-Performing Loans	$ 3,852	$ 3,925

Non-performing Assets and Impaired Loans - Nonaccrual, 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