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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale $ 195,582 $ 218,527    
U.S. Treasury [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 15,717 24,775    
U.S. Government Agencies [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 78,358 82,474    
Mortgage-backed Securities [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 44,234 48,461    
State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 57,273 62,817    
Level 1 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 15,717 24,775    
Level 1 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 15,717 24,775    
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 15,717 24,775    
Level 2 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 178,417 192,334    
Level 2 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 178,417 192,334    
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 78,358 82,474    
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 44,234 48,461    
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 55,825 61,399    
Level 3 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,448 1,418    
Level 3 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,448 1,418    
Level 3 [Member] | State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,448 1,418 $ 1,506 $ 7,352
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 $ 1,448 $ 1,418