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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale $ 206,388 $ 218,527    
U.S. Treasury [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 19,735 24,775    
U.S. Government Agencies [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 82,640 82,474    
Mortgage-backed Securities [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 46,043 48,461    
State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 57,970 62,817    
Level 1 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 19,735 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 19,735 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 19,735 24,775    
Level 2 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 185,239 192,334    
Level 2 [Member] | Fair Value on a Recurring Basis [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 185,239 192,334    
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 82,640 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 46,043 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 56,556 61,399    
Level 3 [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,414 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 1,414 1,418    
Level 3 [Member] | State and Local Governments [Member]        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Total Securities Available for Sale 1,414 1,418 $ 7,115 $ 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 $ 1,414 $ 1,418