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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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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 | $ 113,321 | $ 45,876
Available-for-Sale, Less than 12 Months, Unrealized Losses | (643) | (138)
Available-for-Sale, 12 Months or More, Fair Value | 7,014 | 12,914
Available-for-Sale, 12 Months or More, Unrealized Losses | (170) | (241)
Held-to-Maturity, Less than 12 Months, Fair Value | 30,666 | 538
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (333) | (2)
Held-to-Maturity, 12 Months or More, Fair Value | 1,608 | 11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses | (38) | (52)
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 | 80,061 | 24,459
Available-for-Sale, Less than 12 Months, Unrealized Losses | (396) | (67)
Available-for-Sale, 12 Months or More, Fair Value | 7,014 | 7,630
Available-for-Sale, 12 Months or More, Unrealized Losses | (170) | (125)
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 | 32,027 | 19,069
Available-for-Sale, Less than 12 Months, Unrealized Losses | (234) | (70)
Available-for-Sale, 12 Months or More, Fair Value |  | 1,304
Available-for-Sale, 12 Months or More, Unrealized Losses |  | (23)
Held-to-Maturity, Less than 12 Months, Fair Value | 14,823 | 538
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (130) | (2)
Corporate notes [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 | 790 |
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1) |
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 | 443 | 269
Available-for-Sale, Less than 12 Months, Unrealized Losses | (12) |
Held-to-Maturity, Less than 12 Months, Fair Value | 574 |
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (6) |
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 |  | 1,999
Available-for-Sale, Less than 12 Months, Unrealized Losses |  | (1)
Held-to-Maturity, Less than 12 Months, Fair Value | 15,269 |
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (197) |
Held-to-Maturity, 12 Months or More, Fair Value | 1,608 | 11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses | $ (38) | (52)
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 |  | 80
Available-for-Sale, 12 Months or More, Fair Value |  | 3,980
Available-for-Sale, 12 Months or More, Unrealized Losses |  | $ (93)

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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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + Details
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