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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | $ 253,119 | $ 324,509 |  |
U.S. Treasury [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 25,282 | 25,272 |  |
U.S. Government agency [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 118,956 | 172,972 |  |
Mortgage-backed securities [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 31,133 | 44,792 |  |
State and local governments [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 77,748 | 81,473 |  |
Level 1 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 25,282 | 25,272 |  |
Level 1 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 25,282 | 25,272 |  |
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 | 25,282 | 25,272 |  |
Level 1 [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 |  | 0 |  |
Level 1 [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 |  | 0 |  |
Level 1 [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 | 0 | 0 |  |
Level 2 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 219,930 | 288,891 |  |
Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 219,930 | 288,891 |  |
Level 2 [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 | 0 | 0 |  |
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 | 118,956 | 172,972 |  |
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 | 31,133 | 44,792 |  |
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 | 69,841 | 71,127 |  |
Level 3 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 7,907 | 10,346 |  |
Level 3 [Member] | Fair Value on a Recurring Basis [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 7,907 | 10,346 |  |
Level 3 [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 | 0 | 0 |  |
Level 3 [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 | 0 | 0 |  |
Level 3 [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 | 0 | 0 |  |
Level 3 [Member] | State and local governments [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Total Securities Available for Sale | 7,907 | 10,346 | 12,042 | 16,408
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 | $ 7,907 | $ 10,346 |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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