Quarterly report pursuant to Section 13 or 15(d)

Loans - Credit Quality of Loan Portfolio (Detail)

v3.3.0.814
Loans - Credit Quality of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans $ 3,045,072 $ 2,788,498  
Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,739,554 2,512,425  
Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 722,437 686,486  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 549,583 468,082  
Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 340,304 370,560  
Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 902,897 854,142  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 26,228 9,532  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 198,105 123,623  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 280,784 248,462  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 121,848 116,061  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 126,697 93,586  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 32,239 38,815  
Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 24,734 27,611  
Non-PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 3,019,927 2,743,997 $ 2,612,246
Non-PCI Loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,907,737 2,611,123  
Non-PCI Loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 72,123 85,487  
Non-PCI Loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 40,067 47,387  
Non-PCI Loans [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,714,645 2,468,296  
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 715,169 676,143  
Non-PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 544,148 455,220  
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 334,518 362,815  
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 897,512 843,462  
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 26,228 9,532  
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 197,070 121,124  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 701,707 655,431  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 497,759 398,158  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 321,151 346,350  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 878,561 823,373  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 26,228 9,532  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 195,313 118,880  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 10,783 18,013  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 34,961 46,365  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 8,721 8,899  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 8,880 9,543  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0 0  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 60 66  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,679 2,699  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 11,428 10,697  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 4,646 7,566  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 10,071 10,546  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0 0  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,697 2,178  
Non-PCI Loans [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 280,591 248,135  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 121,655 115,734  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 126,697 93,586  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 32,239 38,815  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 114,007 105,987  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 120,675 92,038  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 29,854 36,007  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,174 1,225  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 5,058 993  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,385 252  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 6,474 8,522  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 964 555  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0 2,556  
Non-PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 24,691 27,566  
Non-PCI Loans [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 22,482 25,367  
Non-PCI Loans [Member] | Consumer loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 101 131  
Non-PCI Loans [Member] | Consumer loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans $ 2,108 $ 2,068