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Contractual Maturities of Total Debt Securities Held (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturing in one year or less $ 2,000,000 $ 4,134,000
Maturing after one year through three years 13,428,000 21,089,000
Maturing after three years 5,970,000 6,114,000
Total debt securities 21,398,000 31,337,000
Municipal Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturing in one year or less   34,000
Maturing after one year through three years   2,215,000
Total debt securities   2,249,000
Municipal bonds - available for sale
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturing in one year or less 2,000,000 4,100,000
Maturing after one year through three years 13,428,000 18,874,000
Maturing after three years 5,970,000 6,114,000
Total debt securities $ 21,398,000 $ 29,088,000