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Amortized Cost and Fair Value of Held-to-Maturity Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 8,161 $ 568
Unrealized Gains 4 11
Unrealized Losses (17)  
Fair Value 8,148 579
U.S. Agency securities
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 4,464  
Unrealized Losses (16)  
Fair Value 4,448  
Municipal securities
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 568 568
Unrealized Gains 4 11
Fair Value 572 579
Corporate securities
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,129  
Unrealized Losses (1)  
Fair Value $ 3,128