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
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 3,284 $ 6,687  
60-89 Days Past Due 4,489 3,175  
90 Days or More Past Due 7,136 6,605  
Total Past Due 14,909 16,467  
Current 2,172,480 2,032,093  
Total Loans 2,187,389 2,048,560 1,949,624
Accruing 90 Days or More Past Due        
Real estate loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 976,436 888,872  
Real estate loans [Member] | Retail [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due        
60-89 Days Past Due    111  
90 Days or More Past Due        
Total Past Due    111  
Current 440,071 392,834  
Total Loans 440,071 392,945  
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 13,446 13,672  
Total Loans 13,446 14,007  
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        
90 Days or More Past Due        
Total Past Due        
Current 434,265 380,142  
Total Loans 434,265 380,142  
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 219 588  
90 Days or More Past Due 810 311  
Total Past Due 1,029 899  
Current 87,625 100,879  
Total Loans 88,654 101,778  
Accruing 90 Days or More Past Due        
Commercial and industrial loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 1,175,573 1,123,012  
Commercial and industrial loans [Member] | Unsecured [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 416 918  
60-89 Days Past Due 455 1,103  
90 Days or More Past Due 1,885 1,279  
Total Past Due 2,756 3,300  
Current 99,273 106,872  
Total Loans 102,029 110,172  
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        
90 Days or More Past Due 122 926  
Total Past Due 122 2,875  
Current 838,404 771,317  
Total Loans 838,526 774,192  
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        
60-89 Days Past Due 146 188  
90 Days or More Past Due 188 416  
Total Past Due 334 604  
Current 44,861 55,517  
Total Loans 45,195 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 2,376 3,759  
60-89 Days Past Due 2,707 1,039  
90 Days or More Past Due 3,718 2,800  
Total Past Due 8,801 7,598  
Current 148,439 140,708  
Total Loans 157,240 148,306  
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 32,583 34,221  
Total Loans 32,583 34,221  
Accruing 90 Days or More Past Due        
Consumer loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 35,380 36,676  
Consumer loans [Member] | Consumer loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 492 61  
60-89 Days Past Due 962 146  
90 Days or More Past Due 413 538  
Total Past Due 1,867 745  
Current 33,513 35,931  
Total Loans 35,380 36,676  
Accruing 90 Days or More Past Due