Quarterly report pursuant to Section 13 or 15(d)

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

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Loans - Troubled Debt Restructurings, Disaggregated by Loan Class (Parenthetical) (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Real estate loans [Member] | Hotel/Motel [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment   $ 1,000,000    
Amount of loan modification through extension of maturity     1,000,000  
Real estate loans [Member] | Gas station [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment 2,000,000 91,000 2,000,000 91,000
Real estate loans [Member] | Other [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment 385,000 365,000 1,300,000 356,000
Loan modifications made through reduction of principal or accrued interest payments   649,000   130,000
Amount of loan modification through extension of maturity     59,000 649,000
Real estate loans [Member] | Retail [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity     1,900,000  
Real estate loans [Member] | Residential property [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity     311,000  
Commercial and industrial loans [Member] | Commercial term [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment 381,000   39,000 388,000
Loan modifications made through reduction of principal or accrued interest payments     51,000  
Amount of loan modification through extension of maturity 621,000   173,000 1,200,000
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modification made through deferrals principal payment 2,200,000   2,400,000  
Loan modifications made through reduction of principal or accrued interest payments     134,000  
Commercial and industrial loans [Member] | International loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modifications made through reduction of principal or accrued interest payments       1,200,000
Commercial and industrial loans [Member] | Consumer loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modifications made through reduction of principal or accrued interest payments       $ 149,000