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Subordinated Debentures (Details Textual) (USD $) | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Oct. 31, 2004 Horizon Statutory Trust Two [Member] | Dec. 31, 2012 Horizon Statutory Trust Two [Member] | Dec. 31, 2006 Horizon Bancorp Capital Trust Three [Member] | Dec. 31, 2012 Horizon Bancorp Capital Trust Three [Member] | Jun. 30, 2004 Alliance Financial Statutory Trust One [Member] | Dec. 31, 2012 Alliance Financial Statutory Trust One [Member] | Mar. 31, 2004 Am Tru Statutory Trust One [Member] | Dec. 31, 2012 Am Tru Statutory Trust One [Member] | Dec. 31, 2006 Heartland Statutory Trust Two [Member] | Dec. 31, 2012 Heartland Statutory Trust Two [Member]
Subordinated Debentures (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  | $ 10,300,000 |  | $ 12,400,000 |  | $ 5,200,000 |  | $ 3,500,000 |  | $ 3,000,000 |
Securities bearing interest rate |  |  | 90 day LIBOR plus 1.95% |  | 90 day LIBOR plus 1.65% |  | 90 day LIBOR plus 2.65% |  | 90 day LIBOR plus 2.85% |  | 90 day LIBOR plus 1.67% |
Junior subordinated debentures and the securities bear interest rate |  |  | 1.95% |  | 1.65% |  | 2.65% |  | 2.85% |  | 1.67% |
Interest rate on junior subordinated debentures and securities |  |  |  | 2.26% |  | 1.95% |  | 2.96% |  | 3.16% |  | 1.98%
LIBOR period | 3 months |  | 90 days |  | 90 days |  | 90 days |  | 90 days |  | 90 days |
Junior subordinated debentures and the securities bear interest maturity date |  |  | Oct. 21, 2034 |  | Jan. 30, 2037 |  | Jun. 01, 2034 |  | Mar. 01, 2034 |  | Dec. 01, 2036 |
Cost of issuance of the securities |  |  | 17,500 |  | 12,647 |  |  |  |  |  |  |
First call date of the securities |  |  | Oct. 31, 2009 |  | Mar. 26, 2007 |  |  |  |  |  |  |
Carrying value of securities, net of remaining purchase discount | $ 32,331,000 | $ 30,676,000 |  |  |  |  |  |  |  | $ 2,800,000 |  | $ 1,500,000

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- Definition Interest rate stated in the contractual 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 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 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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