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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
Oct. 31, 2003
Jun. 30, 2003
Dec. 31, 2019
Subordinate Debenture [Line Items]              
LIBOR period             3 months
Salin Bank Shares [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold         $ 20,000,000.0    
Securities bearing interest rate             90-day LIBOR plus 2.95%
Junior subordinated debentures and the securities variable rate         2.95%    
LIBOR period             90 days
Interest rate on junior subordinated debentures and securities             4.86%
Junior subordinated debentures maturity date             Oct. 01, 2033
Carrying value of securities, net of remaining purchase discount             $ 17,700,000
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             3.86%
Junior subordinated debentures maturity date             Nov. 23, 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             3.56%
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             4.56%
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             4.76%
Junior subordinated debentures maturity date             Dec. 01, 2033
Carrying value of securities, net of remaining purchase discount             $ 3,500,000
Heartland Statutory Trust Two [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold $ 3,000,000.0            
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             3.58%
Junior subordinated debentures maturity date             Dec. 01, 2036
Carrying value of securities, net of remaining purchase discount             $ 1,900,000
City Savings Trust [Member]              
Subordinate Debenture [Line Items]              
Trust Preferred Capital Securities Sold           $ 5,000,000.0  
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             5.01%
Junior subordinated debentures maturity date             Jun. 01, 2033
Carrying value of securities, net of remaining purchase discount             $ 4,400,000