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Detail of Non-Performing Loans and Non-Performing Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans on non-accrual status $ 18,506 [1] $ 23,306 [1] $ 28,317 [1]
Loans past due 90 days or more and still on accrual 3,173    
Total non-performing loans 21,679 23,306 28,317
Other real estate owned 47,882 34,262 40,286
Other Real Estate Owned
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Other real estate owned $ 26,203 $ 10,956 $ 11,969
[1] Loans on non-accrual status include impaired loans.