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Assets and Liabilities Measured at Fair Value on Recurring or Non-recurring Basis Using Significant Unobservable Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 25,219 $ 32,636
Impaired Loans
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 17,259 23,462
Valuation Technique Appraised Value/ Discounted Cash Flows Market Value of Note Appraised Value/ Discounted Cash Flows Market Value of Note
Significant Unobservable Inputs Appraisals and/or sales of comparable properties/ Independent quotes Appraisals and/or sales of comparable properties/ Independent quotes
Other Real Estate Owned
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 7,960 $ 9,174
Valuation Technique Appraised Value/ Comparable Sales/ Other Estimates from Independent Sources Appraised Value/ Comparable Sales/ Other Estimates from Independent Sources
Significant Unobservable Inputs Appraisals and/or sales of comparable properties/ Independent quotes Appraisals and/or sales of comparable properties/ Independent quotes