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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable $ 4,582,883 $ 4,304,458  
Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 3,792,350 3,590,914  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 809,287 681,325  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 67,682 55,190  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 516,968 521,853  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 396,383 399,201  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 186,249 182,685  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 178,570 181,894  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 31,564 34,622  
Leases Receivable [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 379,455 297,284  
Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans and leases receivable 14,695 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 843 680  
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 2,815 2,295  
Non-PCI Loans and Leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 17,968 17,529  
Current 4,564,915 4,286,929  
Total Loans and leases receivable 4,582,883 4,304,458 $ 4,195,355
Non-PCI Loans and Leases [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 8,608 8,478  
Current 3,783,742 3,582,436  
Total Loans and leases receivable 3,792,350 3,590,914  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Commercial property loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 5,716 7,869  
Current 3,201,984 3,006,002  
Total Loans and leases receivable 3,207,700 3,013,871  
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 1,345 741  
Current 922,662 914,532  
Total Loans and leases receivable 924,007 915,273  
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 2,314 3,987  
Current 806,973 677,338  
Total Loans and leases receivable 809,287 681,325  
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 2,057 3,141  
Current 1,472,349 1,414,132  
Total Loans and leases receivable 1,474,406 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 67,682 55,190  
Total Loans and leases receivable 67,682 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 2,892 609  
Current 514,076 521,244  
Total Loans and leases receivable 516,968 521,853  
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 2,384 2,258  
Current 393,999 396,943  
Total Loans and leases receivable 396,383 399,201  
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 1,797 1,826  
Current 184,452 180,859  
Total Loans and leases receivable 186,249 182,685  
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 587 432  
Current 177,983 181,462  
Total Loans and leases receivable 178,570 181,894  
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 31,564 34,622  
Total Loans and leases receivable 31,564 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 6,871 6,793  
Current 372,584 290,491  
Total Loans and leases receivable 379,455 297,284  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 105 0  
Current 14,590 17,059  
Total Loans and leases receivable 14,695 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 6,231 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 2,468 5,371  
Non-PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Commercial property loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 258 4,762  
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 221 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 0 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 37 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 2,210 609  
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 256 430  
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 587 250  
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 105 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 2,866 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 2,056 1,516  
Non-PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member] | Commercial property loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 1,374 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 765 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 609 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 682 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 144 567  
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 144 567  
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 666 944  
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 8,871 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 4,084 1,591  
Non-PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Commercial property loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans and leases receivable 4,084 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 359 630  
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 2,314 398  
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 1,411 563  
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 1,397 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 1,397 829  
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 3,390 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