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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale $ 253,119 $ 324,509    
U.S. Treasury [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 25,282 25,272    
U.S. Government agency [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 118,956 172,972    
Mortgage-backed securities [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 31,133 44,792    
State and local governments [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 77,748 81,473    
Level 1 [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 25,282 25,272    
Level 1 [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 25,282 25,272    
Level 1 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 25,282 25,272    
Level 1 [Member] | U.S. Government agency [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale   0    
Level 1 [Member] | Mortgage-backed securities [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale   0    
Level 1 [Member] | State and local governments [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 0 0    
Level 2 [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 219,930 288,891    
Level 2 [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 219,930 288,891    
Level 2 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 0 0    
Level 2 [Member] | U.S. Government agency [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 118,956 172,972    
Level 2 [Member] | Mortgage-backed securities [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 31,133 44,792    
Level 2 [Member] | State and local governments [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 69,841 71,127    
Level 3 [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 7,907 10,346    
Level 3 [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 7,907 10,346    
Level 3 [Member] | U.S. Treasury [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 0 0    
Level 3 [Member] | U.S. Government agency [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 0 0    
Level 3 [Member] | Mortgage-backed securities [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 0 0    
Level 3 [Member] | State and local governments [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 7,907 10,346 12,042 16,408
Level 3 [Member] | State and local governments [Member] | Fair Value on a Recurring Basis [Member]
        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale $ 7,907 $ 10,346