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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
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