Quarterly report pursuant to Section 13 or 15(d)

Loans - Analysis of Past Due Loans, Disaggregated by Loan Class (Detail)

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Loans - Analysis of Past Due Loans, Disaggregated by Loan Class (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 5,923,000 $ 6,687,000  
60-89 Days Past Due 3,570,000 3,175,000  
90 Days or More Past Due 6,505,000 6,605,000  
Total Past Due 15,998,000 16,467,000  
Current 2,143,273,000 2,032,093,000  
Total Loans 2,159,271,000 2,048,560,000 2,048,560,000
Accruing 90 Days or More Past Due       
Real estate loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 970,095,000 888,872,000  
Real estate loans [Member] | Retail [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 2,270,000     
60-89 Days Past Due   111,000  
90 Days or More Past Due       
Total Past Due 2,270,000 111,000  
Current 462,372,000 392,834,000  
Total Loans 464,642,000 392,945,000  
Accruing 90 Days or More Past Due       
Real estate loans [Member] | Land [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due       
60-89 Days Past Due       
90 Days or More Past Due   335,000  
Total Past Due   335,000  
Current 5,594,000 13,672,000  
Total Loans 5,594,000 14,007,000  
Accruing 90 Days or More Past Due       
Real estate loans [Member] | Other [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due       
60-89 Days Past Due 1,768,000     
90 Days or More Past Due       
Total Past Due 1,768,000     
Current 415,572,000 380,142,000  
Total Loans 417,340,000 380,142,000  
Accruing 90 Days or More Past Due       
Real estate loans [Member] | Residential property [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due       
60-89 Days Past Due   588,000  
90 Days or More Past Due 561,000 311,000  
Total Past Due 561,000 899,000  
Current 81,958,000 100,879,000  
Total Loans 82,519,000 101,778,000  
Accruing 90 Days or More Past Due       
Commercial and Industrial loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,155,111,000 1,123,012,000  
Commercial and Industrial loans [Member] | Unsecured [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,309,000 918,000  
60-89 Days Past Due 389,000 1,103,000  
90 Days or More Past Due 692,000 1,279,000  
Total Past Due 2,390,000 3,300,000  
Current 94,604,000 106,872,000  
Total Loans 96,994,000 110,172,000  
Accruing 90 Days or More Past Due       
Commercial and Industrial loans [Member] | Secured by real estate [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 285,000 1,949,000  
60-89 Days Past Due 300,000     
90 Days or More Past Due 415,000 926,000  
Total Past Due 1,000,000 2,875,000  
Current 815,027,000 771,317,000  
Total Loans 816,027,000 774,192,000  
Accruing 90 Days or More Past Due       
Commercial and Industrial loans [Member] | Commercial lines of credit [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due       
60-89 Days Past Due   188,000  
90 Days or More Past Due   416,000  
Total Past Due   604,000  
Current 54,374,000 55,517,000  
Total Loans 54,374,000 56,121,000  
Accruing 90 Days or More Past Due       
Commercial and Industrial loans [Member] | SBA loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,743,000 3,759,000  
60-89 Days Past Due 1,086,000 1,039,000  
90 Days or More Past Due 4,542,000 2,800,000  
Total Past Due 7,371,000 7,598,000  
Current 146,619,000 140,708,000  
Total Loans 153,990,000 148,306,000  
Accruing 90 Days or More Past Due       
Commercial and Industrial loans [Member] | International loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due       
60-89 Days Past Due       
90 Days or More Past Due       
Total Past Due       
Current 33,726,000 34,221,000  
Total Loans 33,726,000 34,221,000  
Accruing 90 Days or More Past Due       
Consumer Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 34,065,000 36,676,000  
Consumer Loans [Member] | Consumer loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 316,000 61,000  
60-89 Days Past Due 27,000 146,000  
90 Days or More Past Due 295,000 538,000  
Total Past Due 638,000 745,000  
Current 33,427,000 35,931,000  
Total Loans 34,065,000 36,676,000  
Accruing 90 Days or More Past Due