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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Consumer loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modifications made through reduction of principal or accrued interest payments   $ 149,000   $ 149,000
Real estate loans [Member] | Retail [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 1,900,000   1,900,000  
Real estate loans [Member] | Other [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 62,000   62,000  
Loan modifications made through reduction of principal or accrued interest payments   140,000   140,000
Loan modification made through deferrals principal payment     943,000  
Real estate loans [Member] | Residential property [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity 313,000   313,000  
Commercial and industrial loans [Member] | Commercial term [Member]
       
Financing Receivable, Modifications [Line Items]        
Amount of loan modification through extension of maturity   456,000 181,000 650,000
Loan modifications made through reduction of principal or accrued interest payments 12,000 42,000 65,000 42,000
Loan modification made through deferrals principal payment 41,000   41,000 7,000
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modifications made through reduction of principal or accrued interest payments 140,000   140,000  
Loan modification made through deferrals principal payment     238,000  
Commercial and industrial loans [Member] | International loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Loan modifications made through reduction of principal or accrued interest payments       $ 1,300,000