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
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable $ 4,542,126 $ 4,304,458  
Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 3,781,209 3,590,914  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 786,635 681,325  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 61,287 55,190  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 539,861 521,853  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 396,522 399,201  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 185,756 182,685  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 179,872 181,894  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 30,894 34,622  
Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 350,578 297,284  
Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 13,817 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 139 680  
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 2,302 2,295  
Non-PCI Loans and Leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 17,984 17,529  
Current 4,524,142 4,286,929  
Total Loans and leases receivable 4,542,126 4,304,458 $ 4,073,062
Non-PCI Loans and Leases [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 10,970 8,478  
Current 3,770,239 3,582,436  
Total Loans and leases receivable 3,781,209 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 1,045 741  
Current 922,616 914,532  
Total Loans and leases receivable 923,661 915,273  
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 3,789 3,987  
Current 782,846 677,338  
Total Loans and leases receivable 786,635 681,325  
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 4,493 3,141  
Current 1,465,272 1,414,132  
Total Loans and leases receivable 1,469,765 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 61,287 55,190  
Total Loans and leases receivable 61,287 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 1,643 609  
Current 538,218 521,244  
Total Loans and leases receivable 539,861 521,853  
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 699 2,258  
Current 395,823 396,943  
Total Loans and leases receivable 396,522 399,201  
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 699 1,826  
Current 185,057 180,859  
Total Loans and leases receivable 185,756 182,685  
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 179,872 181,462  
Total Loans and leases receivable 179,872 181,894  
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 30,894 34,622  
Total Loans and leases receivable 30,894 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 6,215 6,793  
Current 344,363 290,491  
Total Loans and leases receivable 350,578 297,284  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 100 0  
Current 13,717 17,059  
Total Loans and leases receivable 13,817 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 9,177 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 6,636 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 50 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 1,381 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 3,562 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 1,643 609  
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 139 430  
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 100 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 2,697 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 1,988 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 300 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 1,588 168  
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 100 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 197 567  
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 197 567  
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 512 944  
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 0 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 6,110 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 2,346 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 695 630  
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 820 398  
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 831 563  
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 363 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 363 829  
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 3,401 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