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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Retail [Member] | Real estate loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity   $ 177,000   $ 177,000
Other [Member] | Real estate loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 649,000      
Loan modification made through deferrals principal payment   532,000    
Unsecured [Member] | Commercial and Industrial loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 621,000 750,000 1,200,000 2,200,000
Loan modification made through deferrals principal payment 381,000 9,000 381,000 884,000
Loan modification made through reduction of principal or accrued interest payments       1,900,000
Secured by real estate [Member] | Commercial and Industrial loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity   1,400,000   1,900,000
Loan modification made through deferrals principal payment 1,400,000 3,100,000 1,400,000 3,100,000
Loan modification made through reduction of principal or accrued interest payments       338,000
SBA loans [Member] | Commercial and Industrial loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment 91,000 48,000 98,000 551,000
Loan modification made through reduction of principal or accrued interest payments   41,000 130,000 449,000
Commercial lines of credit [Member] | Commercial and Industrial loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments 0     188,000
Land [Member] | Real estate loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment       532,000
Other [Member] | Real estate loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity     649,000  
International loans [Member] | Commercial and Industrial loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments     1,200,000  
Consumer loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through reduction of principal or accrued interest payments     $ 149,000