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Subordinated Debentures - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Oct. 31, 2004 | Dec. 31, 2006 | Jun. 30, 2004 | Mar. 31, 2004 | Dec. 31, 2013
Subordinate Debenture [Line Items] |  |  |  |  |  |
LIBOR period | 3 months |  |  |  |  |
Carrying value of securities, net of remaining purchase discount | $ 32,642,000 us-gaap_SubordinatedDebt |  |  |  |  | $ 32,486,000 us-gaap_SubordinatedDebt
Horizon Statutory Trust Two [Member] |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  | 10,300,000 hbnc_PreferredCapitalSecuritiesSoldByEntityWhollyOwnedTrust / dei_LegalEntityAxis = hbnc_HorizonStatutoryTrustTwoMember |  |  |  |
Securities bearing interest rate | 90-day LIBOR plus 1.95% |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  | 1.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = hbnc_HorizonStatutoryTrustTwoMember |  |  |  |
LIBOR period | 90 days |  |  |  |  |
Interest rate on junior subordinated debentures and securities | 2.19%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = hbnc_HorizonStatutoryTrustTwoMember |  |  |  |  |
Junior subordinated debentures maturity date | Oct. 21, 2034 |  |  |  |  |
Cost of issuance of the securities |  | 17,500 hbnc_DebtIssuanceCostCapitalized / dei_LegalEntityAxis = hbnc_HorizonStatutoryTrustTwoMember |  |  |  |
First call date of the securities | Oct. 31, 2009 |  |  |  |  |
Horizon Bancorp Capital Trust Three [Member] |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  | 12,400,000 hbnc_PreferredCapitalSecuritiesSoldByEntityWhollyOwnedTrust / dei_LegalEntityAxis = hbnc_HorizonBancorpCapitalTrustThreeMember |  |  |
Securities bearing interest rate | 90-day LIBOR plus 1.65% |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  | 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = hbnc_HorizonBancorpCapitalTrustThreeMember |  |  |
LIBOR period | 90 days |  |  |  |  |
Interest rate on junior subordinated debentures and securities | 1.88%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = hbnc_HorizonBancorpCapitalTrustThreeMember |  |  |  |  |
Junior subordinated debentures maturity date | Jan. 30, 2037 |  |  |  |  |
Cost of issuance of the securities |  |  | 12,647 hbnc_DebtIssuanceCostCapitalized / dei_LegalEntityAxis = hbnc_HorizonBancorpCapitalTrustThreeMember |  |  |
Alliance Financial Statutory Trust One [Member] |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  | 5,200,000 hbnc_PreferredCapitalSecuritiesSoldByEntityWhollyOwnedTrust / dei_LegalEntityAxis = hbnc_AllianceFinancialStatutoryTrustOneMember |  |
Securities bearing interest rate | 90-day LIBOR plus 2.65% |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  |  | 2.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = hbnc_AllianceFinancialStatutoryTrustOneMember |  |
LIBOR period | 90 days |  |  |  |  |
Interest rate on junior subordinated debentures and securities | 2.89%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = hbnc_AllianceFinancialStatutoryTrustOneMember |  |  |  |  |
Junior subordinated debentures maturity date | Jun. 01, 2034 |  |  |  |  |
Am Tru Statutory Trust One [Member] |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  |  | 3,500,000 hbnc_PreferredCapitalSecuritiesSoldByEntityWhollyOwnedTrust / dei_LegalEntityAxis = hbnc_AmTruStatutoryTrustOneMember |
Securities bearing interest rate | 90-day LIBOR plus 2.85% |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  |  |  | 2.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = hbnc_AmTruStatutoryTrustOneMember |
LIBOR period | 90 days |  |  |  |  |
Interest rate on junior subordinated debentures and securities | 3.09%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = hbnc_AmTruStatutoryTrustOneMember |  |  |  |  |
Junior subordinated debentures maturity date | Mar. 01, 2034 |  |  |  |  |
Carrying value of securities, net of remaining purchase discount | 2,900,000 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = hbnc_AmTruStatutoryTrustOneMember |  |  |  |  |
Heartland Statutory Trust Two [Member] |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  | 3,000,000 hbnc_PreferredCapitalSecuritiesSoldByEntityWhollyOwnedTrust / dei_LegalEntityAxis = hbnc_HeartlandStatutoryTrustTwoMember |  |  |
Securities bearing interest rate | 90-day LIBOR plus 1.67% |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  | 1.67%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = hbnc_HeartlandStatutoryTrustTwoMember |  |  |
LIBOR period | 90 days |  |  |  |  |
Interest rate on junior subordinated debentures and securities | 1.91%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = hbnc_HeartlandStatutoryTrustTwoMember |  |  |  |  |
Junior subordinated debentures maturity date | Dec. 01, 2036 |  |  |  |  |
Carrying value of securities, net of remaining purchase discount | $ 1,500,000 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = hbnc_HeartlandStatutoryTrustTwoMember |  |  |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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