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Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 627 $ 816
Unrealized Gains 12 16
Unrealized Losses      
Fair Value 639 832
Municipal securities
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 627 816
Unrealized Gains 12 16
Unrealized Losses      
Fair Value $ 639 $ 832