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Investment Securities - Additional Information (Detail) (USD $)
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12 Months Ended | |
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Dec. 31, 2013
Security
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Dec. 31, 2012
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| Investments Debt And Equity Securities [Abstract] | ||
| Number of debt securities continues loss position for more than twelve months | 2 | |
| Number of debt securities continues loss position for less than twelve months | 49 | |
| Investment securities available-for-sale carrying amount | $ 72,700,000 | $ 61,600,000 |
| Gains realized on sales of securities available-for-sale | 500,000 | 1,000 |
| Losses on sales of securities | $ 0 | $ 0 |