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Investment Securities - Additional Information (Detail) (USD $) |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 Investment | Sep. 30, 2013 Government and Agencies Debt Securities Investment | Sep. 30, 2013 Government and Agencies Debt Securities Investment | Sep. 30, 2013 Municipal Obligations | Sep. 30, 2012 Agency mortgage-backed securities | Sep. 30, 2012 Agency mortgage-backed securities | Sep. 30, 2012 Agency CMO | Sep. 30, 2012 Agency CMO
Investment [Line Items] |  |  |  |  |  |  |  |
Number of investment positions in continuous loss position | 84 | 82 | 82 |  |  |  |  |
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis |  |  | 3.20% |  |  |  |  |
Gross gains on sales of available for sale securities |  | $ 8,000 | $ 8,000 | $ 21,000 | $ 35,000 | $ 2,000 |  |
Gross losses on sales of available for sale securities |  |  |  |  |  |  | $ 8,000 | $ 8,000

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the volatility of the security's fair value, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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