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Loans - Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans:      
Loans - Gross $ 608,993 $ 576,343  
Less: Net deferred loan fees and costs (389) (230)  
Loans after net deferred loan fees and costs 608,604 576,113  
Less: Allowance for loan losses (5,916) (5,194) (5,224)
Loans - Net 602,688 570,919  
Consumer Real Estate [Member]
     
Loans:      
Loans - Gross 97,651 92,438  
Agricultural Real Estate [Member]
     
Loans:      
Loans - Gross 48,812 44,301  
Agricultural [Member]
     
Loans:      
Loans - Gross 67,221 65,449  
Commercial Real Estate [Member]
     
Loans:      
Loans - Gross 274,074 248,893  
Commercial and Industrial [Member]
     
Loans:      
Loans - Gross 92,926 99,498  
Consumer [Member]
     
Loans:      
Loans - Gross 23,455 21,406  
Industrial Development Bonds [Member]
     
Loans:      
Loans - Gross $ 4,854 $ 4,358