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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale $ 196,398 $ 218,527
U.S. Treasury [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 20,978 24,775
U.S. Government Agencies [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 80,466 82,474
Mortgage-backed Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 39,510 48,461
State and Local Governments [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 55,444 62,817
Level 1 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 20,978 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 20,978 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 20,978 24,775
Level 2 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 173,992 192,334
Level 2 [Member] | Fair Value on a Recurring Basis [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 173,992 192,334
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 80,466 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 39,510 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 54,016 61,399
Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total Securities Available for Sale 1,428 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 1,428 1,418
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 $ 1,428 $ 1,418