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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale $ 224,473 $ 235,115    
U.S. Treasury [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 31,059 38,505    
U.S. Government Agencies [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 99,654 98,220    
Mortgage-backed Securities [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 30,390 26,324    
State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 63,370 72,066    
Level 1 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 31,059 38,505    
Level 1 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 31,059 38,505    
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 31,059 38,505    
Level 2 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 191,873 189,258    
Level 2 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 191,873 189,258    
Level 2 [Member] | U.S. Government Agencies [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 99,654 98,220    
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 30,390 26,324    
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 61,829 64,714    
Level 3 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,541 7,352    
Level 3 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,541 7,352    
Level 3 [Member] | State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,541 7,352 $ 7,605 $ 7,931
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 $ 1,541 $ 7,352