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Subordinated Debentures - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2006
Oct. 31, 2004
Jun. 30, 2004
Mar. 30, 2004
Jun. 30, 2003
Dec. 31, 2017
Dec. 31, 2016
Subordinate Debenture [Line Items]              
Junior subordinated debentures and the securities variable rate           2.75%  
LIBOR period           3 months  
Junior subordinated debentures maturity date           Jul. 13, 2019  
Carrying value of securities, net of remaining purchase discount           $ 37,653,000 $ 37,456,000
Horizon Statutory Trust Two [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold   $ 10,300,000          
Securities bearing interest rate           90-day LIBOR plus 1.95%  
Junior subordinated debentures and the securities variable rate   1.95%          
LIBOR period           90 days  
Interest rate on junior subordinated debentures and securities           3.64%  
Junior subordinated debentures maturity date           Oct. 21, 2034  
Cost of issuance of the securities   $ 17,500          
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            
Securities bearing interest rate           90-day LIBOR plus 1.65%  
Junior subordinated debentures and the securities variable rate 1.65%            
LIBOR period           90 days  
Interest rate on junior subordinated debentures and securities           3.34%  
Junior subordinated debentures maturity date           Jan. 30, 2037  
Cost of issuance of the securities $ 12,647            
Alliance Financial Statutory Trust One [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold     $ 5,200,000        
Securities bearing interest rate           90-day LIBOR plus 2.65%  
Junior subordinated debentures and the securities variable rate     2.65%        
LIBOR period           90 days  
Interest rate on junior subordinated debentures and securities           4.34%  
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      
Securities bearing interest rate           90-day LIBOR plus 2.85%  
Junior subordinated debentures and the securities variable rate       2.85%      
LIBOR period           90 days  
Interest rate on junior subordinated debentures and securities           4.54%  
Junior subordinated debentures maturity date           Mar. 01, 2034  
Carrying value of securities, net of remaining purchase discount           $ 3,300,000  
Heartland Statutory Trust Two [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold $ 3,000,000            
Securities bearing interest rate           90-day LIBOR plus 1.67%  
Junior subordinated debentures and the securities variable rate 1.67%            
LIBOR period           90 days  
Interest rate on junior subordinated debentures and securities           3.36%  
Junior subordinated debentures maturity date           Dec. 01, 2036  
Carrying value of securities, net of remaining purchase discount           $ 1,800,000  
City Savings Trust [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold         $ 5,000,000    
Securities bearing interest rate           90-day LIBOR plus 3.10%  
Junior subordinated debentures and the securities variable rate         3.10%    
LIBOR period           90 days  
Interest rate on junior subordinated debentures and securities           4.79%  
Junior subordinated debentures maturity date           Jun. 01, 2033  
Carrying value of securities, net of remaining purchase discount           $ 4,400,000