Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Loans and Leases - Credit Quality of Loans and Leases Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases $ 4,304,458 $ 3,844,769
Real estate loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 3,590,914 3,278,375
Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 915,273 859,953
Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 681,325 651,158
Real estate loans [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 55,190 55,962
Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 521,853 338,767
Commercial and industrial loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 399,201 300,220
Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 182,685 138,168
Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 181,894 136,231
Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 34,622 25,821
Leases Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 297,284 243,294
Consumer loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 17,059 22,880
Non-PCI Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 4,296,710 3,834,906
Non-PCI Loans [Member] | Pass/Pass-Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 4,254,450 3,788,374
Non-PCI Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 17,141 16,267
Non-PCI Loans [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 25,119 30,265
Non-PCI Loans [Member] | Real estate loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 3,583,255 3,268,698
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 913,628 857,629
Non-PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 679,683 649,540
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 1,413,852 1,367,776
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 55,190 55,962
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 520,902 337,791
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 3,549,704 3,230,926
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 909,462 851,147
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 667,085 634,397
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 1,397,657 1,352,193
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 55,190 55,962
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 520,310 337,227
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 16,452 11,328
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 454 2,275
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 4,880 5,497
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 10,813 3,556
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 305 0
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 17,099 26,444
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 3,712 4,207
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 7,718 9,646
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 5,382 12,027
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 287 564
Non-PCI Loans [Member] | Commercial and industrial loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 399,152 300,084
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 182,636 138,032
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 181,894 136,231
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 34,622 25,821
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 179,835 133,811
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 181,462 135,699
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 34,622 23,406
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 439 2,060
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 250 464
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 0 2,415
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 2,362 2,161
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 182 68
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 0 0
Non-PCI Loans [Member] | Leases Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 297,284 243,294
Non-PCI Loans [Member] | Leases Receivable [Member] | Pass/Pass-Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 292,832 242,393
Non-PCI Loans [Member] | Leases Receivable [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 0 0
Non-PCI Loans [Member] | Leases Receivable [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 4,452 901
Non-PCI Loans [Member] | Consumer loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 17,019 22,830
Non-PCI Loans [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 15,995 22,139
Non-PCI Loans [Member] | Consumer loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases 0 0
Non-PCI Loans [Member] | Consumer loans [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans and Leases $ 1,024 $ 691