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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
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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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