Quarterly report pursuant to Section 13 or 15(d)

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

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Loans - Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring Within Previous Twelve Months, Disaggregated by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
SecurityLoan
Mar. 31, 2012
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans 10 23
Recorded Investment $ 2,256 $ 5,495
Real Estate Loans [Member] | Retail [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans    1
Recorded Investment    102
Real Estate Loans [Member] | Other [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans    1
Recorded Investment    279
Real Estate Loans [Member] | Residential Property [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans    1
Recorded Investment    865
Commercial and Industrial Loans [Member] | Unsecured [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 7 10
Recorded Investment 730 3,401
Commercial and Industrial Loans [Member] | Secured By Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1   
Recorded Investment 1,306   
Commercial and Industrial Loans [Member] | Commercial Lines of Credit [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1   
Recorded Investment 188   
Commercial and Industrial Loans [Member] | SBA Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 10
Recorded Investment $ 32 $ 848