Quarterly report pursuant to Section 13 or 15(d)

Troubled Debt Restructurings, Disaggregated by Class of Loans (Parenthetical) (Detail)

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Troubled Debt Restructurings, Disaggregated by Class of Loans (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Real Estate Loan [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity $ 177   $ 177  
Loan modifications made through deferral principal payments       2,900
Residential Property [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modifications made through deferral principal payments   449 1,300  
Commercial Lines of Credit [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 120 120 120 120
Loan modifications made through reductions of principal or accrued interest payments     188  
SBA Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modifications made through deferral principal payments 48 2,300 551 6,200
Loan modifications made through reductions of principal or accrued interest payments 41 273 449 919
Secured by Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 1,400 3,300 1,400 3,300
Loan modifications made through deferral principal payments 3,100 4,900 3,100 7,400
Loan modifications made through reductions of principal or accrued interest payments   1,200 338 9,300
Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modifications made through deferral principal payments 532 3,800,000   5,600,000
Unsecured [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 750 700 750 700
Loan modifications made through deferral principal payments 9 1,200 884 1,200
Loan modifications made through reductions of principal or accrued interest payments   6,300 1,900 11,300
Commercial and Industrial Loans [Member] | Unsecured [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity $ 2,200 $ 1,100 $ 2,200 $ 1,100