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Foreclosed Assets - Foreclosed Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate, Subtotal $ 1,572 $ 3,509
Valuation Allowance On Foreclosed Asset    (1,139)
Foreclosed assets, net 1,572 2,370
Non-owner occupied [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate, Subtotal 1,029 1,161
Land [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate, Subtotal 447 2,348
Single-family residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Real estate, Subtotal $ 96