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Investment Securities - Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | $ 166,471 | $ 134,908
Available-for-Sale, Gross Unrealized Gains | 3,268 | 2,422
Available-for-Sale, Gross Unrealized Losses | (629) | (1,576)
Available-for-Sale, Estimated Fair Value | 169,110 | 135,754
Held-to-Maturity, Amortized Cost | 40,835 | 35,050
Held-to-Maturity, Gross Unrealized Gains | 24 |
Held-to-Maturity, Gross Unrealized Losses | (639) |
Held-to-Maturity, Estimated Fair Value | 40,220 |
Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 110,284 | 82,840
Available-for-Sale, Gross Unrealized Gains | 1,901 | 1,479
Available-for-Sale, Gross Unrealized Losses | (289) | (885)
Available-for-Sale, Estimated Fair Value | 111,896 | 83,434
Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 36,084 | 30,677
Available-for-Sale, Gross Unrealized Gains | 259 | 143
Available-for-Sale, Gross Unrealized Losses | (110) | (355)
Available-for-Sale, Estimated Fair Value | 36,233 | 30,465
Held-to-Maturity, Amortized Cost | 2,880 |
Held-to-Maturity, Gross Unrealized Gains | 24 |
Held-to-Maturity, Gross Unrealized Losses | 0 |
Held-to-Maturity, Estimated Fair Value | 2,904 |
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 15,533 | 16,230
Available-for-Sale, Gross Unrealized Gains | 1,108 | 799
Available-for-Sale, Gross Unrealized Losses | 0 | (2)
Available-for-Sale, Estimated Fair Value | 16,641 | 17,027
Held-to-Maturity, Amortized Cost | 589 |
Held-to-Maturity, Gross Unrealized Gains | 0 |
Held-to-Maturity, Gross Unrealized Losses | 0 |
Held-to-Maturity, Estimated Fair Value | 589 |
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 4,157 | 4,161
Available-for-Sale, Gross Unrealized Gains | 0 |
Available-for-Sale, Gross Unrealized Losses | (228) | (334)
Available-for-Sale, Estimated Fair Value | 3,929 | 3,827
Obligations of U.S. Government Sponsored Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 413 | 1,000
Available-for-Sale, Gross Unrealized Gains | 0 | 1
Available-for-Sale, Gross Unrealized Losses | (2) |
Available-for-Sale, Estimated Fair Value | 411 | 1,001
Held-to-Maturity, Amortized Cost |  | 35,050
Held-to-Maturity, Gross Unrealized Losses |  | (1,685)
Held-to-Maturity, Estimated Fair Value |  | 33,365
US Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held-to-Maturity, Amortized Cost | 37,366 |
Held-to-Maturity, Gross Unrealized Gains | 0 |
Held-to-Maturity, Gross Unrealized Losses | (639) |
Held-to-Maturity, Estimated Fair Value | $ 36,727 |

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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + 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 No definition available. + Details
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