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Gross Unrealized Losses and Fair Value, Aggregated by Investment Category and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position (Detail) - U.S. government agencies - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Gain (Loss) on Investments [Line Items]    
Less than 12 Months, Fair Value $ 17,981 $ 23,950
Less than 12 Months, Unrealized Losses (18) (50)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 17,981 23,950
Total, Unrealized Losses $ (18) $ (50)