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Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Amounts reclassified from accumulated other comprehensive income (loss), Net Unrealized gains (losses) on Investment Securities $ 0 $ 1,285 $ 59