Annual report pursuant to Section 13 and 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 $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Retail [Member] | Real estate loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through deferrals principal payment   $ 357,000  
Amount of loan modification through extension of maturity   175,000 1,300,000
Other [Member] | Real estate loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through deferrals principal payment   527,000 2,400,000
Amount of loan modification through extension of maturity 645,000    
Residential property [Member] | Real estate loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through deferrals principal payment     2,700,000
Unsecured [Member] | Commercial and Industrial loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through deferrals principal payment 380,000 909,000 1,600,000
Amount of loan modification through extension of maturity 2,400,000 3,600,000 1,500,000
Loan modification made through reduction of principal or accrued interest payments 733,000 723,000 11,500,000
Secured by real estate [Member] | Commercial and Industrial loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through deferrals principal payment 1,400,000 5,400,000 2,400,000
Amount of loan modification through extension of maturity   1,900,000 2,700,000
Loan modification made through reduction of principal or accrued interest payments 1,400,000 318,000 9,100,000
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 191,000 188,000  
SBA loans [Member] | Commercial and Industrial loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through deferrals principal payment 97,000 504,000 5,700,000
Loan modification made through reduction of principal or accrued interest payments 124,000 447,000 957,000
International loans [Member] | Commercial and Industrial loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through reduction of principal or accrued interest payments 1,100,000    
Consumer loans [Member]
      
Financing Receivable, Modifications [Line Items]      
Loan modification made through reduction of principal or accrued interest payments $ 149,000