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, 2014
Dec. 31, 2013
Jun. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 4,643 $ 3,607  
60-89 Days Past Due 1,414 4,072  
90 Days or More Past Due 10,853 8,595  
Total Past Due 16,910 16,274  
Current 2,332,325 2,217,815  
Total Loans 2,349,235 2,234,089 2,187,389
Accruing 90 Days or More Past Due 0 0  
Real estate loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,090,083 1,969,798 1,964,853
Real estate loans [Member] | Retail [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 820 202  
60-89 Days Past Due   426  
90 Days or More Past Due 732 2,196  
Total Past Due 1,552 2,825  
Current 560,102 540,794  
Total Loans 561,654 543,619  
Accruing 90 Days or More Past Due   0  
Real estate loans [Member] | Hotel/Motel [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 53 1,087  
90 Days or More Past Due 2,462 1,532  
Total Past Due 2,515 2,619  
Current 335,613 320,308  
Total Loans 338,128 322,927  
Accruing 90 Days or More Past Due   0  
Real estate loans [Member] | Gas station [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 166 141  
60-89 Days Past Due   410  
90 Days or More Past Due 3,947 153  
Total Past Due 4,113 704  
Current 278,984 291,853  
Total Loans 283,097 292,557  
Accruing 90 Days or More Past Due 0 0  
Real estate loans [Member] | Other [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 356 423  
60-89 Days Past Due 11 2,036  
90 Days or More Past Due 930 839  
Total Past Due 1,297 3,297  
Current 795,879 728,320  
Total Loans 797,176 731,617  
Accruing 90 Days or More Past Due 0 0  
Real estate loans [Member] | Construction [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 1,467    
Total Loans 1,467    
Accruing 90 Days or More Past Due 0    
Real estate loans [Member] | Residential property [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 884    
60-89 Days Past Due   122  
90 Days or More Past Due 113 279  
Total Past Due 997 401  
Current 107,564 78,677  
Total Loans 108,561 79,078  
Accruing 90 Days or More Past Due 0 0  
Commercial and industrial loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 230,309 231,786 187,156
Commercial and industrial loans [Member] | Commercial term [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,975 1,443  
60-89 Days Past Due 587 886  
90 Days or More Past Due 2,623 3,269  
Total Past Due 5,185 5,598  
Current 110,308 118,793  
Total Loans 115,493 124,391  
Accruing 90 Days or More Past Due 0 0  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 140    
60-89 Days Past Due 795 150  
90 Days or More Past Due   250  
Total Past Due 935 400  
Current 69,866 70,642  
Total Loans 70,801 71,042  
Accruing 90 Days or More Past Due 0 0  
Commercial and industrial loans [Member] | International loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 44,015 36,353  
Total Loans 44,015 36,353  
Accruing 90 Days or More Past Due 0 0  
Consumer loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 249 311  
60-89 Days Past Due 21 42  
90 Days or More Past Due 46 77  
Total Past Due 316 430  
Current 28,527 32,075  
Total Loans 28,843 32,505 35,380
Accruing 90 Days or More Past Due $ 0 $ 0