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Fair Value of Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | $ 307,725 | $ 324,509
U.S. Treasury [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 25,229 | 25,272
U.S. Government agency [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 159,866 | 172,972
Mortgage-backed securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 42,815 | 44,792
State and local governments [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 79,815 | 81,473
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 25,229 | 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 | 25,229 | 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 | 25,229 | 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 |  |
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 |  |
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 |  |
Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 273,840 | 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 | 273,840 | 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 |  |
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 | 159,866 | 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 | 42,815 | 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 | 71,159 | 71,127
Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Securities Available for Sale | 8,656 | 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 | 8,656 | 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 |  |
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 |  |
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 |  |
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 | $ 8,656 | $ 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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