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 $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 7,934 $ 6,687  
60-89 Days Past Due 2,067 3,175  
90 Days or More Past Due 8,396 6,605  
Total Past Due 18,397 16,467  
Current 2,103,289 2,032,093  
Total Loans 2,121,686 2,048,560 1,976,978
Accruing 90 Days or More Past Due        
Real Estate Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 925,754 888,872 834,056
Real Estate Loans [Member] | Retail [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 2,004     
60-89 Days Past Due   111  
90 Days or More Past Due       
Total Past Due 2,004 111  
Current 401,198 392,834  
Total Loans 403,202 392,945  
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  
Total Past Due   335  
Current 13,739 13,672  
Total Loans 13,739 14,007  
Accruing 90 Days or More Past Due        
Real Estate Loans [Member] | Other [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
60-89 Days Past Due       
90 Days or More Past Due       
Total Past Due       
Current 414,078 380,142  
Total Loans 414,078 380,142  
Accruing 90 Days or More Past Due        
Real Estate Loans [Member] | Construction [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
60-89 Days Past Due       
90 Days or More Past Due       
Total Past Due       
Current       
Total Loans       
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 222     
60-89 Days Past Due   588  
90 Days or More Past Due 819 311  
Total Past Due 1,041 899  
Current 93,694 100,879  
Total Loans 94,735 101,778  
Accruing 90 Days or More Past Due        
Commercial and Industrial Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,160,752 1,123,012 1,102,140
Commercial and Industrial Loans [Member] | Unsecured [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,005 918  
60-89 Days Past Due 724 1,103  
90 Days or More Past Due 1,470 1,279  
Total Past Due 3,199 3,300  
Current 95,301 106,872  
Total Loans 98,500 110,172  
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   1,949  
60-89 Days Past Due 122     
90 Days or More Past Due 926 926  
Total Past Due 1,048 2,875  
Current 821,461 771,317  
Total Loans 822,509 774,192  
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 238     
60-89 Days Past Due   188  
90 Days or More Past Due 604 416  
Total Past Due 842 604  
Current 48,766 55,517  
Total Loans 49,608 56,121  
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 4,158 3,759  
60-89 Days Past Due 1,205 1,039  
90 Days or More Past Due 4,006 2,800  
Total Past Due 9,369 7,598  
Current 149,318 140,708  
Total Loans 158,687 148,306  
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 31,448 34,221  
Total Loans 31,448 34,221  
Accruing 90 Days or More Past Due        
Consumer Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 35,180 36,676 40,782
Consumer Loans [Member] | Consumer Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 307 61  
60-89 Days Past Due 16 146  
90 Days or More Past Due 571 538  
Total Past Due 894 745  
Current 34,286 35,931  
Total Loans 35,180 36,676  
Accruing 90 Days or More Past Due