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Investment Securities - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 Investment | Jun. 30, 2014 Investment | Jun. 30, 2013 | Jun. 30, 2014 Investment | Jun. 30, 2013 | Dec. 31, 2013
Investment [Line Items] |  |  |  |  |  |
Number of investment positions in continuous loss position | 65 | 65 |  | 65 |  |
Gross gains on sales of available for sale securities |  | $ 54,000 | $ 0 | $ 54,000 | $ 21,000 |
Number of shares acquired | 31,750 |  |  |  |  | 100,000
Percentage of outstanding in common stock | 9.00% | 9.00% |  | 9.00% |  |
Cost method investment (included in other assets) | 711,000 | 711,000 |  | 711,000 |  |
Municipal obligations |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Gross gains on sales of available for sale securities |  | $ 54,000 | $ 0 | $ 54,000 | $ 21,000 |
Government and agencies debt securities |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Number of investment positions in continuous loss position | 64 | 64 |  | 64 |  |
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis |  |  |  | 1.80% |  |

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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 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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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + 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 210.5-02.12) -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 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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