Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Credit Quality of PCI Loan (Detail)

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Loans and Leases - Credit Quality of PCI Loan (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable $ 4,195,355   $ 3,844,769      
Allowance 32,492   32,429      
Loans and leases receivable, net 4,162,863   3,812,340      
Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 3,539,558   3,278,375      
Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 364,456   300,220      
Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 19,070   22,880      
PCI Loans and Leases [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 8,704   9,863 $ 15,540    
Allowance 794 $ 720 971 5,533 $ 5,448 $ 5,441
Loans and leases receivable, net 7,910   8,892 $ 10,007   $ 14,573
PCI Loans and Leases [Member] | Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 8,610   9,677      
Allowance 752   922      
Loans and leases receivable, net 7,858   8,755      
PCI Loans and Leases [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 51   136      
Allowance 41   41      
Loans and leases receivable, net 10   95      
PCI Loans and Leases [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 43   50      
Allowance 1   8      
Loans and leases receivable, net 42   42      
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 1,257   1,153      
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 1,257   1,153      
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 0   0      
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 0   0      
PCI Loans and Leases [Member] | Special Mention [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 357   1,180      
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 357   1,180      
PCI Loans and Leases [Member] | Special Mention [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 0   0      
PCI Loans and Leases [Member] | Special Mention [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 0   0      
PCI Loans and Leases [Member] | Classified [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 7,090   7,530      
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 6,996   7,344      
PCI Loans and Leases [Member] | Classified [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 51   136      
PCI Loans and Leases [Member] | Classified [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable $ 43   $ 50