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Investment Securities - Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | $ 177,479 | $ 134,908
Available-for-Sale, Gross Unrealized Gains | 2,825 | 2,422
Available-for-Sale, Gross Unrealized Losses | (958) | (1,576)
Available-for-Sale, Estimated Fair Value | 179,346 | 135,754
Held-to-Maturity, Amortized Cost | 36,524 | 35,050
Held-to-Maturity, Gross Unrealized Gains | 17 |
Held-to-Maturity, Gross Unrealized Losses | (450) |
Held-to-Maturity, Estimated Fair Value | 36,091 |
Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 122,911 | 82,840
Available-for-Sale, Gross Unrealized Gains | 1,450 | 1,479
Available-for-Sale, Gross Unrealized Losses | (594) | (885)
Available-for-Sale, Estimated Fair Value | 123,767 | 83,434
Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 34,331 | 30,677
Available-for-Sale, Gross Unrealized Gains | 167 | 143
Available-for-Sale, Gross Unrealized Losses | (152) | (355)
Available-for-Sale, Estimated Fair Value | 34,346 | 30,465
Held-to-Maturity, Amortized Cost | 3,281 |
Held-to-Maturity, Gross Unrealized Gains | 17 |
Held-to-Maturity, Gross Unrealized Losses | (5) |
Held-to-Maturity, Estimated Fair Value | 3,293 |
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 15,695 | 16,230
Available-for-Sale, Gross Unrealized Gains | 1,207 | 799
Available-for-Sale, Gross Unrealized Losses | (3) | (2)
Available-for-Sale, Estimated Fair Value | 16,899 | 17,027
Held-to-Maturity, Amortized Cost | 586 |
Held-to-Maturity, Gross Unrealized Losses | (2) |
Held-to-Maturity, Estimated Fair Value | 584 |
U.S. Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 4,155 | 4,161
Available-for-Sale, Gross Unrealized Losses | (209) | (334)
Available-for-Sale, Estimated Fair Value | 3,946 | 3,827
Obligations of U.S. Government Sponsored Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale, Amortized Cost | 387 | 1,000
Available-for-Sale, Gross Unrealized Gains | 1 | 1
Available-for-Sale, Estimated Fair Value | 388 | 1,001
Held-to-Maturity, Amortized Cost | 32,657 | 35,050
Held-to-Maturity, Gross Unrealized Losses | (443) | (1,685)
Held-to-Maturity, Estimated Fair Value | $ 32,214 | $ 33,365

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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