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Subordinated Debentures - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2004
Horizon Statutory Trust Two [Member]
Dec. 31, 2013
Horizon Statutory Trust Two [Member]
Dec. 31, 2006
Horizon Bancorp Capital Trust Three [Member]
Dec. 31, 2013
Horizon Bancorp Capital Trust Three [Member]
Jun. 30, 2004
Alliance Financial Statutory Trust One [Member]
Dec. 31, 2013
Alliance Financial Statutory Trust One [Member]
Mar. 31, 2004
Am Tru Statutory Trust One [Member]
Dec. 31, 2013
Am Tru Statutory Trust One [Member]
Dec. 31, 2006
Heartland Statutory Trust Two [Member]
Dec. 31, 2013
Heartland Statutory Trust Two [Member]
Subordinate Debenture [Line Items]                        
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%  
LIBOR period 3 months     90 days   90 years   90 years   90 years   90 years
Interest rate on junior subordinated debentures and securities       2.26%   1.95%   2.96%   3.16%   1.98%
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 $ 32,486,000 $ 32,331,000             $ 2,900,000   $ 1,500,000