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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Less than 12 Months, Fair Value $ 3,533 $ 50,574
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses (2) (129)
Held-to-maturity Securities, 12 Months or Longer, Fair Value 0 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 3,533 50,574
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (2) (129)
U.S. Agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Less than 12 Months, Fair Value   43,723
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses   (106)
Held-to-maturity Securities, 12 Months or Longer, Fair Value   0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses   0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value   43,723
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss   (106)
Corporate securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Less than 12 Months, Fair Value 3,533 6,851
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses (2) (23)
Held-to-maturity Securities, 12 Months or Longer, Fair Value 0 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses 0 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value 3,533 6,851
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss $ (2) $ (23)