Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
SecurityLoan
Dec. 31, 2011
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans 12 14
Recorded Investment $ 907 $ 3,818
Commercial and Industrial Loans [Member] | Unsecured [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 8 6
Recorded Investment 554 2,368
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 3 8
Recorded Investment $ 165 $ 1,450