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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | $ 192,811 | $ 218,527
U.S. Treasury [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 15,676 | 24,775
U.S. Government Agencies [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 78,160 | 82,474
Mortgage-backed Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 41,990 | 48,461
State and Local Governments [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 56,985 | 62,817
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 15,676 | 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 | 15,676 | 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 | 15,676 | 24,775
Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 175,693 | 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 | 175,693 | 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 | 78,160 | 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 | 41,990 | 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 | 55,543 | 61,399
Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 1,442 | 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 | 1,442 | 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 | $ 1,442 | $ 1,418

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