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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale $ 226,512 $ 235,115    
U.S. Treasury [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 33,721 38,505    
U.S. Government Agencies [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 102,814 98,220    
Mortgage-backed Securities [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 25,147 26,324    
State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 64,830 72,066    
Level 1 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 33,721 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 33,721 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 33,721 38,505    
Level 2 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 185,676 189,258    
Level 2 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 185,676 189,258    
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 102,814 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 25,147 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 57,715 64,714    
Level 3 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 7,115 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 7,115 7,352    
Level 3 [Member] | State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 7,115 7,352 $ 7,837 $ 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 $ 7,115 $ 7,352