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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
Dec. 31, 2012
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 816 $ 3,490
Unrealized Gains 16 42
Unrealized Losses      
Fair Value 832 3,532
Municipal securities
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 816 3,490
Unrealized Gains 16 42
Unrealized Losses      
Fair Value $ 832 $ 3,532