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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | $ 244,786 | $ 248,492 |  |
U.S. Treasury [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 38,904 | 25,393 |  |
U.S. Government Agency [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 100,804 | 119,234 |  |
Mortgage-backed Securities [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 28,028 | 29,562 |  |
State and Local Governments [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 77,050 | 74,303 |  |
Level 1 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 38,904 | 25,393 |  |
Level 1 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 38,904 | 25,393 |  |
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 | 38,904 | 25,393 |  |
Level 2 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 198,277 | 215,168 |  |
Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 198,277 | 215,168 |  |
Level 2 [Member] | U.S. Government Agency [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 100,804 | 119,234 |  |
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 | 28,028 | 29,562 |  |
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 | 69,445 | 66,372 |  |
Level 3 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 7,605 | 7,931 |  |
Level 3 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 7,605 | 7,931 |  |
Level 3 [Member] | State and Local Governments [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 7,605 | 7,931 | $ 7,907 | $ 10,346
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 | $ 7,605 | $ 7,931 |  |

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