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Investment Securities - Additional Information (Detail) (USD $) | 12 Months Ended |  | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Mar. 31, 2014 Investment | Mar. 31, 2013 Municipal obligations | Mar. 31, 2014 Government and agencies debt securities Investment
Investment [Line Items] |  |  |  |
Number of investment positions in continuous loss position |  | 85 |  | 83
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis |  |  |  | 2.30%
Gross gains on sales of available for sale securities |  |  | $ 21,000 |
Number of shares acquired | 100,000 |  |  |
Percentage of outstanding in common stock | 7.00% |  |  |
Total investment | $ 540,000 |  |  |

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