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Investment Securities - Investment Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 203,281	$ 202,039
Available-for-Sale, Gross Unrealized Gains	2,354	3,306
Available-for-Sale, Gross Unrealized Losses	(916)	(379)
Available-for-Sale, Estimated Fair Value	204,719	204,966
Held-to-Maturity, Amortized Cost	34,290	29,120
Held-to-Maturity, Gross Unrealized Gains	75	88
Held-to-Maturity, Gross Unrealized Losses	(143)	(54)
Held-to-Maturity, Estimated Fair Value	34,222	29,154
Residential [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	137,596	139,980
Available-for-Sale, Gross Unrealized Gains	1,236	1,896
Available-for-Sale, Gross Unrealized Losses	(328)	(192)
Available-for-Sale, Estimated Fair Value	138,504	141,684
Commercial [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	46,371	35,873
Available-for-Sale, Gross Unrealized Gains	196	164
Available-for-Sale, Gross Unrealized Losses	(574)	(93)
Available-for-Sale, Estimated Fair Value	45,993	35,944
Held-to-Maturity, Amortized Cost	16,144	10,666
Held-to-Maturity, Gross Unrealized Gains	41	65
Held-to-Maturity, Gross Unrealized Losses	(103)	(2)
Held-to-Maturity, Estimated Fair Value	16,082	10,729
Obligations of States and Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	14,448	15,673
Available-for-Sale, Gross Unrealized Gains	918	1,241
Available-for-Sale, Gross Unrealized Losses	(8)
Available-for-Sale, Estimated Fair Value	15,358	16,914
Held-to-Maturity, Amortized Cost	2,315	584
Held-to-Maturity, Gross Unrealized Gains	1	4
Held-to-Maturity, Gross Unrealized Losses	(4)
Held-to-Maturity, Estimated Fair Value	2,312	588
Obligations of U.S. Government Sponsored Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	4,000	6,360
Available-for-Sale, Gross Unrealized Gains	2	5
Available-for-Sale, Gross Unrealized Losses	(6)	(1)
Available-for-Sale, Estimated Fair Value	3,996	6,364
Held-to-Maturity, Amortized Cost	15,831	17,870
Held-to-Maturity, Gross Unrealized Gains	33	19
Held-to-Maturity, Gross Unrealized Losses	(36)	(52)
Held-to-Maturity, Estimated Fair Value	15,828	17,837
Corporate notes [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	786
Available-for-Sale, Gross Unrealized Gains	2
Available-for-Sale, Estimated Fair Value	788
U.S. Treasury Securities [Member]
Schedule Of Available For Sale And Held To Maturity 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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