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Amortized Cost and Gross Unrealized Holding Gains for Available for Sale Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]    
Amortized cost    $ 2,836
Gross unrealized holding gains    224
Estimated fair value    $ 3,060