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
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 19,200 $ 16,300  
Total Loans 2,675,959   2,159,271
Accruing 90 Days or More Past Due 15    
Real estate loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,411,154   1,921,659
Real estate loans [Member] | Hotel/Motel [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 466,611    
Real estate loans [Member] | Gas station [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 358,455    
Real estate loans [Member] | Construction [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 4,146    
Real estate loans [Member] | Residential property [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 108,730    
Commercial and industrial loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 235,898   203,547
Commercial and industrial loans [Member] | Commercial term [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 119,525    
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 75,246    
Commercial and industrial loans [Member] | International loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 41,127    
Consumer loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 28,907   34,065
Non-PCI Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 10,675 3,607  
60-89 Days Past Due 2,645 4,072  
90 Days or More Past Due 5,916 8,595  
Total Past Due 19,236 16,274  
Current 2,589,699 2,217,815  
Total Loans 2,608,935 2,234,089  
Accruing 90 Days or More Past Due 15    
Non-PCI Loans [Member] | Real estate loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 2,344,538 1,969,798  
Non-PCI Loans [Member] | Real estate loans [Member] | Commercial Real Estate Retails [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,927 202  
60-89 Days Past Due 146 426  
90 Days or More Past Due 182 2,196  
Total Past Due 2,255 2,824  
Current 633,606 540,794  
Total Loans 635,861 543,618  
Non-PCI Loans [Member] | Real estate loans [Member] | Hotel/Motel [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 52 1,087  
60-89 Days Past Due 733    
90 Days or More Past Due 1,203 1,532  
Total Past Due 1,988 2,619  
Current 450,417 320,308  
Total Loans 452,405 322,927  
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 4,781 141  
60-89 Days Past Due 794 410  
90 Days or More Past Due 544 153  
Total Past Due 6,119 704  
Current 334,267 291,853  
Total Loans 340,386 292,557  
Non-PCI Loans [Member] | Real estate loans [Member] | Commercial Real Estate Others [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,867 423  
60-89 Days Past Due 67 2,036  
90 Days or More Past Due 380 839  
Total Past Due 2,314 3,298  
Current 803,382 728,320  
Total Loans 805,696 731,618  
Accruing 90 Days or More Past Due 15    
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 4,146    
Total Loans 4,146    
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 113    
60-89 Days Past Due 121 122  
90 Days or More Past Due 486 279  
Total Past Due 720 401  
Current 105,324 78,677  
Total Loans 106,044 79,078  
Non-PCI Loans [Member] | Commercial and industrial loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 235,548 231,786  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,410 1,443  
60-89 Days Past Due 587 886  
90 Days or More Past Due 2,873 3,269  
Total Past Due 4,870 5,598  
Current 114,305 118,793  
Total Loans 119,175 124,391  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 274    
60-89 Days Past Due 197 150  
90 Days or More Past Due   250  
Total Past Due 471 400  
Current 74,775 70,642  
Total Loans 75,246 71,042  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 251    
Total Past Due 251    
Current 40,876 36,353  
Total Loans 41,127 36,353  
Non-PCI Loans [Member] | Consumer loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due   311  
60-89 Days Past Due   42  
90 Days or More Past Due 248 77  
Total Past Due 248 430  
Current 28,601 32,075  
Total Loans $ 28,849 $ 32,505