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Summary of Assets for Which Nonrecurring Change in Fair Value has been Recorded (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent impaired loans $ 15,519 $ 11,301
Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent impaired loans 15,519 11,301
Foreclosed assets 14,423 15,364
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent impaired loans 15,212 11,016
Foreclosed assets 14,423 14,777
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral dependent impaired loans 307 285
Foreclosed assets   $ 587