Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Analysis of Past Due Loans, Disaggregated by Loan Class, Non-PCI (Detail)

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Loans and Leases - Analysis of Past Due Loans, Disaggregated by Loan Class, Non-PCI (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable $ 4,413,557 $ 4,304,458  
Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 3,667,797 3,590,914  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 731,531 681,325  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 57,896 55,190  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 545,053 521,853  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 409,380 399,201  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 184,083 182,685  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 190,255 181,894  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 35,042 34,622  
Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 321,481 297,284  
Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 14,899 17,059  
30-59 Days Past Due | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 496 680  
30-59 Days Past Due | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
30-59 Days Past Due | Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 2,211 2,295  
Non-PCI Loans and Leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 17,419 17,529  
Current 4,396,138 4,286,929  
Total Loans and leases receivable 4,413,557 4,304,458 $ 3,943,951
Non-PCI Loans and Leases [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 10,134 8,478  
Current 3,657,663 3,582,436  
Total Loans and leases receivable 3,667,797 3,590,914  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 984 741  
Current 908,430 914,532  
Total Loans and leases receivable 909,414 915,273  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 6,404 3,987  
Current 725,127 677,338  
Total Loans and leases receivable 731,531 681,325  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,031 3,141  
Current 1,422,872 1,414,132  
Total Loans and leases receivable 1,423,903 1,417,273  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Current 57,896 55,190  
Total Loans and leases receivable 57,896 55,190  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,715 609  
Current 543,338 521,244  
Total Loans and leases receivable 545,053 521,853  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,161 2,258  
Current 408,219 396,943  
Total Loans and leases receivable 409,380 399,201  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,161 1,826  
Current 182,922 180,859  
Total Loans and leases receivable 184,083 182,685  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 432  
Current 190,255 181,462  
Total Loans and leases receivable 190,255 181,894  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Current 35,042 34,622  
Total Loans and leases receivable 35,042 34,622  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 6,116 6,793  
Current 315,365 290,491  
Total Loans and leases receivable 321,481 297,284  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 8 0  
Current 14,891 17,059  
Total Loans and leases receivable 14,899 17,059  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 10,656 8,346  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 7,943 5,371  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 295 96  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 5,585 3,421  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 348 1,245  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,715 609  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 496 430  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 250  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 6 0  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,224 3,027  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 1,516  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 15  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 168  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 1,333  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 406 567  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 406 567  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 816 944  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 2 0  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 5,539 6,156  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 2,191 1,591  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 689 630  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 819 398  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 683 563  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 259 1,011  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 259 829  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 182  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 3,089 3,554  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable $ 0 $ 0