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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 |  |

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