Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Analysis of Gross Loans and Leases, Disaggregated by Class (Detail)

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Loans and Leases - Analysis of Gross Loans and Leases, Disaggregated by Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases $ 3,844,769 $ 3,183,316
Accruing 90 Days or More Past Due 0 0
Real estate loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 3,278,375 2,845,514
Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 651,158 543,425
Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 262,879 323,655
Real estate loans [Member] | Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 55,962 23,387
Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 338,767 236,036
Commercial and industrial loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 300,220 312,876
Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 138,168 152,773
Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 136,231 128,224
Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 25,821 31,879
Leases Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 243,294 0
Consumer loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 22,880 24,926
30-59 Days Past Due [Member] | Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 80  
30-59 Days Past Due [Member] | Leases Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 2,090  
Non-PCI Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 10,346 15,374
Current 3,824,560 3,147,928
Total loans and Leases 3,834,906 3,163,302
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Real estate loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 3,268,698 2,825,718
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 380 1,183
Current 857,249 734,318
Total loans and Leases 857,629 735,501
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,683 5,139
Current 647,857 534,206
Total loans and Leases 649,540 539,345
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,025 2,882
Current 259,162 316,481
Total loans and Leases 260,187 319,363
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,611 3,441
Current 1,105,978 969,802
Total loans and Leases 1,107,589 973,243
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 0 0
Current 55,962 23,387
Total loans and Leases 55,962 23,387
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,242 396
Current 336,549 234,483
Total loans and Leases 337,791 234,879
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Commercial and industrial loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans and Leases 300,084 312,705
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 637 1,131
Current 137,395 151,471
Total loans and Leases 138,032 152,602
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [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 0 450
Current 136,231 127,774
Total loans and Leases 136,231 128,224
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 80 497
Current 25,741 31,382
Total loans and Leases 25,821 31,879
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | Leases Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 3,518  
Current 239,776  
Total loans and Leases 243,294 0
Non-PCI Loans [Member] | Consumer loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 170 255
Current 22,660 24,624
Total loans and Leases 22,830 24,879
Accruing 90 Days or More Past Due 0 0
Non-PCI Loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 5,277 4,522
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 9 441
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,037 1,250
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 245 959
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 432 1,144
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | 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 [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 730 0
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 484 420
Non-PCI Loans [Member] | 30-59 Days Past Due [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 58
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable   0
Non-PCI Loans [Member] | 30-59 Days Past Due [Member] | Consumer loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 170 250
Non-PCI Loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 2,079 2,214
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 137 343
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 46 49
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 643 406
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 79 661
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | 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 [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 89 0
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 42 253
Non-PCI Loans [Member] | 60-89 Days Past Due [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 0
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 0 497
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Leases Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,043  
Non-PCI Loans [Member] | 60-89 Days Past Due [Member] | Consumer loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 0 5
Non-PCI Loans [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 2,990 8,638
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 234 399
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 600 3,840
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 137 1,517
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 1,100 1,636
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | 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 [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 423 396
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 111 458
Non-PCI Loans [Member] | 90 Days or More Past Due [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 0 392
Non-PCI Loans [Member] | 90 Days or More Past Due [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
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Leases Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable 385  
Non-PCI Loans [Member] | 90 Days or More Past Due [Member] | Consumer loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Past due loans and leases receivable $ 0 $ 0