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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 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 | $ 71,004 | $ 69,120
Available-for-Sale, Less than 12 Months, Unrealized Losses | (399) | (1,558)
Available-for-Sale, 12 Months or More, Fair Value | 18,467 | 271
Available-for-Sale, 12 Months or More, Unrealized Losses | (559) | (18)
Held-to-Maturity, Less than 12 Months, Fair Value | 10,983 |
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (24) |
Held-to-Maturity, 12 Months or More, Fair Value | 21,369 |
Held-to-Maturity, 12 Months or More, Unrealized Losses | (426) |
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 | 48,499 | 43,091
Available-for-Sale, Less than 12 Months, Unrealized Losses | (280) | (885)
Available-for-Sale, 12 Months or More, Fair Value | 13,257 |
Available-for-Sale, 12 Months or More, Unrealized Losses | (314) |
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 | 22,236 | 21,231
Available-for-Sale, Less than 12 Months, Unrealized Losses | (116) | (337)
Available-for-Sale, 12 Months or More, Fair Value | 1,344 | 271
Available-for-Sale, 12 Months or More, Unrealized Losses | (36) | (18)
Held-to-Maturity, Less than 12 Months, Fair Value | 552 |
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (5) |
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 | 269 | 1,050
Available-for-Sale, Less than 12 Months, Unrealized Losses | (3) | (2)
Held-to-Maturity, Less than 12 Months, Fair Value | 583 |
Held-to-Maturity, 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 |  | 3,748
Available-for-Sale, Less than 12 Months, Unrealized Losses |  | (334)
Available-for-Sale, 12 Months or More, Fair Value | 3,866 |
Available-for-Sale, 12 Months or More, Unrealized Losses | (209) |
Obligations of U.S. Government Sponsored Agencies [Member] |  |
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items] |  |
Held-to-Maturity, Less than 12 Months, Fair Value | 9,848 | 33,365
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (17) | (1,685)
Held-to-Maturity, 12 Months or More, Fair Value | 21,369 |
Held-to-Maturity, 12 Months or More, Unrealized Losses | $ (426) |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + 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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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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