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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands | Sep. 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 | $ 88,881 | $ 45,876
Available-for-Sale, Less than 12 Months, Unrealized Losses | (420) | (138)
Available-for-Sale, 12 Months or More, Fair Value | 12,760 | 12,914
Available-for-Sale, 12 Months or More, Unrealized Losses | (496) | (241)
Held-to-Maturity, Less than 12 Months, Fair Value | 18,029 | 538
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (111) | (2)
Held-to-Maturity, 12 Months or More, Fair Value | 1,614 | 11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses | (32) | (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 | 58,366 | 24,459
Available-for-Sale, Less than 12 Months, Unrealized Losses | (203) | (67)
Available-for-Sale, 12 Months or More, Fair Value | 6,649 | 7,630
Available-for-Sale, 12 Months or More, Unrealized Losses | (125) | (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 | 28,077 | 19,069
Available-for-Sale, Less than 12 Months, Unrealized Losses | (203) | (70)
Available-for-Sale, 12 Months or More, Fair Value | 6,111 | 1,304
Available-for-Sale, 12 Months or More, Unrealized Losses | (371) | (23)
Held-to-Maturity, Less than 12 Months, Fair Value | 13,891 | 538
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (103) | (2)
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 | 1,993 | 1,999
Available-for-Sale, Less than 12 Months, Unrealized Losses | (6) | (1)
Held-to-Maturity, Less than 12 Months, Fair Value | 3,205 |
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (4) |
Held-to-Maturity, 12 Months or More, Fair Value | 1,614 | 11,664
Held-to-Maturity, 12 Months or More, Unrealized Losses | (32) | (52)
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 | 445 | 269
Available-for-Sale, Less than 12 Months, Unrealized Losses | (8) |
Held-to-Maturity, Less than 12 Months, Fair Value | 933 |
Held-to-Maturity, Less than 12 Months, Unrealized Losses | $ (4) |
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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