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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 15,620 | $ 69,120
Available-for-Sale, Less than 12 Months, Unrealized Losses | (101) | (1,558)
Available-for-Sale, 12 Months or More, Fair Value | 26,112 | 271
Available-for-Sale, 12 Months or More, Unrealized Losses | (528) | (18)
Residential [Member] |  |
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 5,156 | 43,091
Available-for-Sale, Less than 12 Months, Unrealized Losses | (43) | (885)
Available-for-Sale, 12 Months or More, Fair Value | 18,839 |
Available-for-Sale, 12 Months or More, Unrealized Losses | (246) |
Commercial [Member] |  |
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 10,053 | 21,231
Available-for-Sale, Less than 12 Months, Unrealized Losses | (56) | (337)
Available-for-Sale, 12 Months or More, Fair Value | 3,424 | 271
Available-for-Sale, 12 Months or More, Unrealized Losses | (54) | (18)
Obligations of States and Political Subdivisions [Member] |  |
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value |  | 1,050
Available-for-Sale, Less than 12 Months, Unrealized Losses |  | (2)
U.S. Treasury Securities [Member] |  |
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 0 | 3,748
Available-for-Sale, Less than 12 Months, Unrealized Losses | 0 | (334)
Available-for-Sale, 12 Months or More, Fair Value | 3,849 |
Available-for-Sale, 12 Months or More, Unrealized Losses | (228) |
Obligations of U.S. Government Sponsored Agencies [Member] |  |
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 411 |
Available-for-Sale, Less than 12 Months, Unrealized Losses | (2) |
Available-for-Sale, 12 Months or More, Fair Value | 0 |
Available-for-Sale, 12 Months or More, Unrealized Losses | 0 |
Held-to-Maturity, Less than 12 Months, Fair Value | 5,356 | 33,365
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (16) | (1,685)
Held-to-Maturity, 12 Months or More, Fair Value | 31,370 |
Held-to-Maturity, 12 Months or More, Unrealized Losses | $ (623) |

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- Definition Held-to-maturity securities continuous unrealized loss position less than twelve months accumulated loss. + References No definition available. + Details
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- Definition Held-to-maturity securities, continuous unrealized loss position twelve months or longer accumulated loss. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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