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
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable $ 4,073,062   $ 3,844,769      
Allowance 33,758   32,429      
Loans and leases receivable, net 4,039,304   3,812,340      
Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 3,451,025   3,278,375      
Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 347,236   300,220      
Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 17,276   22,880      
PCI Loans and Leases [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 8,784   9,863 $ 15,020    
Allowance 720 $ 891 971 5,448 $ 5,645 $ 5,441
Loans and leases receivable, net 8,064   8,892 $ 9,572   $ 14,573
PCI Loans and Leases [Member] | Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 8,685   9,677      
Allowance 658   922      
Loans and leases receivable, net 8,027   8,755      
PCI Loans and Leases [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 55   136      
Allowance 41   41      
Loans and leases receivable, net 14   95      
PCI Loans and Leases [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 44   50      
Allowance 21   8      
Loans and leases receivable, net 23   42      
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable 1,243   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 1,243   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 1,108   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 1,108   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 6,433   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 6,334   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 55   136      
PCI Loans and Leases [Member] | Classified [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans and leases receivable $ 44   $ 50