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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | $ 224,473 | $ 235,115 |  |
U.S. Treasury [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 31,059 | 38,505 |  |
U.S. Government Agencies [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 99,654 | 98,220 |  |
Mortgage-backed Securities [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 30,390 | 26,324 |  |
State and Local Governments [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 63,370 | 72,066 |  |
Level 1 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 31,059 | 38,505 |  |
Level 1 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 31,059 | 38,505 |  |
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 | 31,059 | 38,505 |  |
Level 2 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 191,873 | 189,258 |  |
Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 191,873 | 189,258 |  |
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 | 99,654 | 98,220 |  |
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 | 30,390 | 26,324 |  |
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 | 61,829 | 64,714 |  |
Level 3 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 1,541 | 7,352 |  |
Level 3 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 1,541 | 7,352 |  |
Level 3 [Member] | State and Local Governments [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 1,541 | 7,352 | $ 7,605 | $ 7,931
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 | $ 1,541 | $ 7,352 |  |

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