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, 2014
Dec. 31, 2013
Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 8,274 $ 3,607  
60-89 Days Past Due 141 4,072  
90 Days or More Past Due 10,342 8,595  
Total Past Due 18,757 16,274  
Current 2,257,615 2,217,815  
Total Loans 2,276,372 2,234,089 2,121,686
Accruing 90 Days or More Past Due        
Real estate loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,027,914 1,969,798 1,882,445
Real estate loans [Member] | Retail [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 795 202  
60-89 Days Past Due    426  
90 Days or More Past Due 2,583 2,196  
Total Past Due 3,378 2,825  
Current 544,094 540,794  
Total Loans 547,472 543,619  
Accruing 90 Days or More Past Due        
Real estate loans [Member] | Hotel/Motel [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,326 1,087  
60-89 Days Past Due        
90 Days or More Past Due 1,288 1,532  
Total Past Due 2,614 2,619  
Current 329,357 320,308  
Total Loans 331,971 322,927  
Accruing 90 Days or More Past Due        
Real estate loans [Member] | Gas station [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 700 141  
60-89 Days Past Due    410  
90 Days or More Past Due 381 153  
Total Past Due 1,081 704  
Current 285,838 291,853  
Total Loans 286,919 292,557  
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 1,873 423  
60-89 Days Past Due    2,036  
90 Days or More Past Due 1,805 839  
Total Past Due 3,678 3,297  
Current 747,444 728,320  
Total Loans 751,122 731,617  
Accruing 90 Days or More Past Due        
Real estate loans [Member] | Construction [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 125    
Total Loans 125    
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 813     
60-89 Days Past Due    122  
90 Days or More Past Due 114 279  
Total Past Due 927 401  
Current 109,378 78,677  
Total Loans 110,305 79,078  
Accruing 90 Days or More Past Due        
Commercial and industrial loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 219,102 231,786 204,061
Commercial and industrial loans [Member] | Commercial term [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 2,035 1,443  
60-89 Days Past Due 123 886  
90 Days or More Past Due 3,798 3,269  
Total Past Due 5,956 5,598  
Current 110,947 118,793  
Total Loans 116,903 124,391  
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 192     
60-89 Days Past Due    150  
90 Days or More Past Due 146 250  
Total Past Due 338 400  
Current 66,741 70,642  
Total Loans 67,079 71,042  
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 35,120 36,353  
Total Loans 35,120 36,353  
Accruing 90 Days or More Past Due        
Consumer loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 540 311  
60-89 Days Past Due 18 42  
90 Days or More Past Due 227 77  
Total Past Due 785 430  
Current 28,571 32,075  
Total Loans 29,356 32,505 35,180
Accruing 90 Days or More Past Due