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Summary of Assets and Liabilities Measured at Fair Market Value on a Non-Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed assets $ 15,747 $ 19,754
Fair Value, Measurements, Nonrecurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral Dependent Impaired Loans 25,520 27,449
Foreclosed assets 15,747 19,754
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 25,520 27,449
Foreclosed assets 15,747 19,754
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Collateral Dependent Impaired Loans 0 0
Foreclosed assets 0 0
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 0 0
Foreclosed assets $ 0 $ 0