Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Analysis of Past Due Loans, Disaggregated by Loan Class, PCI (Detail) (Details)

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Loans and Leases - Analysis of Past Due Loans, Disaggregated by Loan Class, PCI (Detail) (Details) - 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, Past Due [Line Items]            
Total 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, Past Due [Line Items]            
Total Loans and leases receivable 3,451,025   3,278,375      
Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 739,067   651,158      
Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 249,929   262,879      
Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 383,657   338,767      
Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 347,236   300,220      
Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 159,487   138,168      
Consumer loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 17,276   22,880      
30-59 Days Past Due | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 281   564      
PCI Loans and Leases [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 818   1,392      
Current 7,966   8,471      
Total 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, Past Due [Line Items]            
Past due loans and leases receivable 774   1,336      
Current 7,911   8,341      
Total 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] | Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 1,698   1,618      
PCI Loans and Leases [Member] | Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 2,363   2,692      
PCI Loans and Leases [Member] | Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 965   976      
PCI Loans and Leases [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 5   6      
Current 50   130      
Total Loans and leases receivable 55   136      
Allowance 41   41      
Loans and leases receivable, net 14   95      
PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Total Loans and leases receivable 55   136      
PCI Loans and Leases [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 39   50      
Current 5   0      
Total Loans and leases receivable 44   50      
Allowance 21   8      
Loans and leases receivable, net 23   42      
PCI Loans and Leases [Member] | 30-59 Days Past Due            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 349   975      
PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 349   975      
PCI Loans and Leases [Member] | 30-59 Days Past Due | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 0   0      
PCI Loans and Leases [Member] | 30-59 Days Past Due | Consumer loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 0   0      
PCI Loans and Leases [Member] | 60-89 Days Past Due            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 0   0      
PCI Loans and Leases [Member] | 60-89 Days Past Due | Real estate loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 0   0      
PCI Loans and Leases [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 0   0      
PCI Loans and Leases [Member] | 60-89 Days Past Due | Consumer loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 0   0      
PCI Loans and Leases [Member] | 90 Days or More Past Due            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 469   417      
PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 425   361      
PCI Loans and Leases [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable 5   6      
PCI Loans and Leases [Member] | 90 Days or More Past Due | Consumer loans [Member]            
Financing Receivable, Recorded Investment, Past Due [Line Items]            
Past due loans and leases receivable $ 39   $ 50