Quarterly report pursuant to Section 13 or 15(d)

Loans - Troubled Debt Restructuring, Disaggregated by Loan Class (Parenthetical) (Detail)

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Loans - Troubled Debt Restructuring, Disaggregated by Loan Class (Parenthetical) (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
International loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments     $ 1,300,000  
Unsecured [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 456,000 394,000 650,000 1,600,000
Loan modification made through reduction of principal or accrued interest payments 42,000   42,000 1,900,000
Loan modification made through deferrals principal payment 1,200,000     893,000
Secured by real estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity       497,000
Loan modification made through reduction of principal or accrued interest payments   358,000   1,600,000
Commercial lines of credit [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments 0 192,000   192,000
SBA loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments 140,000 291,000 140,000 442,000
Loan modification made through deferrals principal payment   362,000 7,000 503,000
Consumer loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments $ 149,000   $ 149,000