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Investment Securities - Investment Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | $ 200,699 | $ 202,039
Available-for-Sale, Gross Unrealized Gains | 2,361 | 3,306
Available-for-Sale, Gross Unrealized Losses | (813) | (379)
Available-for-Sale, Estimated Fair Value | 202,247 | 204,966
Held-to-Maturity, Amortized Cost | 43,929 | 29,120
Held-to-Maturity, Gross Unrealized Gains | 71 | 88
Held-to-Maturity, Gross Unrealized Losses | (371) | (54)
Held-to-Maturity, Estimated Fair Value | 43,629 | 29,154
Residential [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 138,119 | 139,980
Available-for-Sale, Gross Unrealized Gains | 1,216 | 1,896
Available-for-Sale, Gross Unrealized Losses | (566) | (192)
Available-for-Sale, Estimated Fair Value | 138,769 | 141,684
Commercial [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 45,144 | 35,873
Available-for-Sale, Gross Unrealized Gains | 237 | 164
Available-for-Sale, Gross Unrealized Losses | (234) | (93)
Available-for-Sale, Estimated Fair Value | 45,147 | 35,944
Held-to-Maturity, Amortized Cost | 17,256 | 10,666
Held-to-Maturity, Gross Unrealized Gains | 48 | 65
Held-to-Maturity, Gross Unrealized Losses | (130) | (2)
Held-to-Maturity, Estimated Fair Value | 17,174 | 10,729
Obligations of States and Political Subdivisions [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 14,566 | 15,673
Available-for-Sale, Gross Unrealized Gains | 907 | 1,241
Available-for-Sale, Gross Unrealized Losses | (12) |
Available-for-Sale, Estimated Fair Value | 15,461 | 16,914
Held-to-Maturity, Amortized Cost | 1,580 | 584
Held-to-Maturity, Gross Unrealized Gains |  | 4
Held-to-Maturity, Gross Unrealized Losses | (6) |
Held-to-Maturity, Estimated Fair Value | 1,574 | 588
Obligations of U.S. Government Sponsored Agencies [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 1,999 | 6,360
Available-for-Sale, Gross Unrealized Gains | 1 | 5
Available-for-Sale, Gross Unrealized Losses |  | (1)
Available-for-Sale, Estimated Fair Value | 2,000 | 6,364
Held-to-Maturity, Amortized Cost | 25,093 | 17,870
Held-to-Maturity, Gross Unrealized Gains | 23 | 19
Held-to-Maturity, Gross Unrealized Losses | (235) | (52)
Held-to-Maturity, Estimated Fair Value | 24,881 | 17,837
Corporate notes [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 791 |
Available-for-Sale, Gross Unrealized Losses | (1) |
Available-for-Sale, Estimated Fair Value | 790 |
U.S. Treasury Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 80 | 4,153
Available-for-Sale, Gross Unrealized Losses |  | (93)
Available-for-Sale, Estimated Fair Value | $ 80 | $ 4,060

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