Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Credit Quality of Loan and Lease Portfolio (Detail)

v3.8.0.1
Loans and Leases - Credit Quality of Loan and Lease Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable $ 4,195,355 $ 3,844,769  
Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,539,558 3,278,375  
Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 917,823 859,953  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 733,226 651,158  
Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 247,430 262,879  
Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,146,189 1,109,656  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 64,263 55,962  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 430,627 338,767  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 364,456 300,220  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 170,942 138,168  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 149,937 136,231  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 43,577 25,821  
Leases Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 272,271 243,294  
Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 19,070 22,880  
Non-PCI Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,186,651 3,834,906 $ 3,537,119
Non-PCI Loans and Leases [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,142,358 3,788,374  
Non-PCI Loans and Leases [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 19,729 16,267  
Non-PCI Loans and Leases [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 24,564 30,265  
Non-PCI Loans and Leases [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,530,948 3,268,698  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 916,236 857,629  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 731,562 649,540  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 245,042 260,187  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,144,176 1,107,589  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 64,263 55,962  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 429,669 337,791  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,494,820 3,230,926  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 910,890 851,147  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 718,244 634,397  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 240,952 252,123  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,131,423 1,100,070  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 64,263 55,962  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 429,048 337,227  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 17,996 11,328  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,577 2,275  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,979 5,497  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 2,274 1,911  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 8,840 1,645  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 326 0  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 18,132 26,444  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,769 4,207  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 8,339 9,646  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,816 6,153  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,913 5,874  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 295 564  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 364,405 300,084  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 170,891 138,032  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 149,937 136,231  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 43,577 25,821  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 360,715 292,916  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 167,492 133,811  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 149,646 135,699  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 43,577 23,406  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,733 4,939  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,623 2,060  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 110 464  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 2,415  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,957 2,229  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,776 2,161  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 181 68  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 272,271 243,294  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 268,893 242,393  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,378 901  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 19,027 22,830  
Non-PCI Loans and Leases [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 17,930 22,139  
Non-PCI Loans and Leases [Member] | Consumer loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Consumer loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable $ 1,097 $ 691