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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value   $ 38,736,000
Less than 12 Months, Unrealized Losses $ 0 (88,000)
12 Months or Longer, Fair Value   0
12 Months or Longer, Unrealized Losses $ 0 0
Fair Value   38,736,000
Unrealized Losses   (88,000)
U.S. Agency securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value   28,188,000
Less than 12 Months, Unrealized Losses   (54,000)
12 Months or Longer, Fair Value   0
12 Months or Longer, Unrealized Losses   0
Fair Value   28,188,000
Unrealized Losses   (54,000)
Corporate securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value   10,548,000
Less than 12 Months, Unrealized Losses   (34,000)
12 Months or Longer, Fair Value   0
12 Months or Longer, Unrealized Losses   0
Fair Value   10,548,000
Unrealized Losses   $ (34,000)