Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Loans and Leases - Credit Quality of Loan and Lease Portfolio (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable $ 4,413,557 $ 4,304,458  
Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,667,797 3,590,914  
Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 909,414 915,273  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 731,531 681,325  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 57,896 55,190  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 545,053 521,853  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 409,380 399,201  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 184,083 182,685  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 190,255 181,894  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 35,042 34,622  
Leases Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 321,481 297,284  
Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 14,899 17,059  
Non-PCI Loans and Leases [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,413,557 4,304,458 $ 3,943,951
Non-PCI Loans and Leases [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,366,668 4,255,791  
Non-PCI Loans and Leases [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 15,636 17,469  
Non-PCI Loans and Leases [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 31,253 31,198  
Non-PCI Loans and Leases [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross 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 [Line Items]      
Total gross loans and leases receivable 909,414 915,273  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 731,531 681,325  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross 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 [Line Items]      
Total gross 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 [Line Items]      
Total gross loans and leases receivable 545,053 521,853  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 3,630,612 3,551,045  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 903,510 909,682  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 717,252 667,254  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,407,438 1,397,658  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 57,896 55,190  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 544,516 521,261  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 13,936 16,780  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 375 454  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,220 4,976  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 9,040 11,045  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 301 305  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 23,249 23,089  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 5,529 5,137  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 10,059 9,095  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 7,425 8,570  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 236 287  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross 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 [Line Items]      
Total gross 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 [Line Items]      
Total gross 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 [Line Items]      
Total gross loans and leases receivable 35,042 34,622  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 404,911 395,919  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 180,355 179,835  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 189,514 181,462  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 35,042 34,622  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 1,498 689  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 757 439  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 741 250  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 2,971 2,593  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 2,971 2,411  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 182  
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Classified [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 321,481 297,284  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 317,281 292,832  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 0 0  
Non-PCI Loans and Leases [Member] | Leases Receivable [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 4,200 4,452  
Non-PCI Loans and Leases [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 14,899 17,059  
Non-PCI Loans and Leases [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 13,864 15,995  
Non-PCI Loans and Leases [Member] | Consumer loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable 202 0  
Non-PCI Loans and Leases [Member] | Consumer loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans and leases receivable $ 833 $ 1,064