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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]  
Less than 12 Months, Fair Value $ 7,576
Less than 12 Months, Unrealized Losses (17)
12 Months or Longer, Fair Value   
12 Months or Longer, Unrealized Losses   
Fair Value 7,576
Unrealized Losses (17)
U.S. Agency securities
  
Schedule of Held-to-maturity Securities [Line Items]  
Less than 12 Months, Fair Value 4,448
Less than 12 Months, Unrealized Losses (16)
12 Months or Longer, Fair Value   
12 Months or Longer, Unrealized Losses   
Fair Value 4,448
Unrealized Losses (16)
Corporate securities
  
Schedule of Held-to-maturity Securities [Line Items]  
Less than 12 Months, Fair Value 3,128
Less than 12 Months, Unrealized Losses (1)
12 Months or Longer, Fair Value   
12 Months or Longer, Unrealized Losses   
Fair Value 3,128
Unrealized Losses $ (1)