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Foreclosed Assets - Expenses Related to Foreclosed Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Foreclosed assets, net $ 652 $ 1,187 $ 4
Covered Assets [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net loss (gain) on sales (338) (7)   
Provision for unrealized losses 962 1,139   
Operating expenses, net of rental income 28 55 4
Foreclosed assets, net $ 652 $ 1,187 $ 4