Quarterly report pursuant to Section 13 or 15(d)

Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring within Previous Twelve Months, Disaggregated by Class of Loans (Detail)

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Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring within Previous Twelve Months, Disaggregated by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
SecurityLoan
Sep. 30, 2011
SecurityLoan
Sep. 30, 2012
SecurityLoan
Sep. 30, 2011
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 9 23 13 48
Number of Loans $ 443 $ 8,505 $ 961 $ 26,431
Real Estate Loan [Member] | Retail [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans       1
Number of Loans       1,425
Real Estate Loan [Member] | Other [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans       2
Number of Loans       1,805
Real Estate Loan [Member] | Residential Property [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans   1   1
Number of Loans   449   449
Commercial and Industrial Loans [Member] | Unsecured [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 3 8 6 18
Number of Loans 171 3,344 431 6,055
Commercial and Industrial Loans [Member] | Secured by Real Estate [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans   3   9
Number of Loans   3,137   10,684
Commercial and Industrial Loans [Member] | Commercial Lines of Credit [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans     1  
Number of Loans     258  
Commercial and Industrial Loans [Member] | SBA Loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 6 11 6 17
Number of Loans $ 272 $ 1,575 $ 272 $ 6,013