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
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable $ 3,943,951 $ 3,844,769    
Allowance 33,152 32,429    
Loans and leases receivable, net 3,910,799 3,812,340    
Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 3,348,875 3,278,375    
Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 652,114 651,158    
Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 256,060 262,879    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 358,745 338,767    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 317,682 300,220    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 135,596 138,168    
Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 17,803 22,880    
PCI Loans and Leases [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 2,664 1,392    
Current 6,296 8,471    
Total Loans and leases receivable 8,960 9,863 $ 19,835  
Allowance 891 971 5,645 $ 5,441
Loans and leases receivable, net 8,069 8,892 $ 14,190 $ 14,573
PCI Loans and Leases [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 8,790 9,677    
PCI Loans and Leases [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 410 1,035    
Current 1,144 1,289    
Total Loans and leases receivable 1,554 2,324    
Allowance 98 122    
Loans and leases receivable, net 1,456 2,202    
PCI Loans and Leases [Member] | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 180 178    
Current 1,416 1,440    
Total Loans and leases receivable 1,596 1,618    
Allowance 140 138    
Loans and leases receivable, net 1,456 1,480    
PCI Loans and Leases [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 116 116    
Current 2,507 2,576    
Total Loans and leases receivable 2,623 2,692    
Allowance 531 589    
Loans and leases receivable, net 2,092 2,103    
PCI Loans and Leases [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 1,903 7    
Current 144 2,060    
Total Loans and leases receivable 2,047 2,067    
Allowance 0 1    
Loans and leases receivable, net 2,047 2,066    
PCI Loans and Leases [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
Current 970 976    
Total Loans and leases receivable 970 976    
Allowance 73 72    
Loans and leases receivable, net 897 904    
PCI Loans and Leases [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans and leases receivable 120 136    
PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 5 6    
Current 115 130    
Total Loans and leases receivable 120 136    
Allowance 41 41    
Loans and leases receivable, net 79 95    
PCI Loans and Leases [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 50 50    
Current   0    
Total Loans and leases receivable 50 50    
Allowance 8 8    
Loans and leases receivable, net 42 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 2,266 975    
PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 183 797    
PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 180 178    
PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Gas station [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 | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 1,903 0    
PCI Loans and Leases [Member] | 30-59 Days Past Due | Real estate loans [Member] | Residential property [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 | Commercial and industrial loans [Member] | Commercial term [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] | Retail [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 | Real estate loans [Member] | Hospitality [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 | Real estate loans [Member] | Gas station [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 | Real estate loans [Member] | Other [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 | Real estate loans [Member] | Residential property [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] | Commercial term [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 398 417    
PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 227 238    
PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Hospitality [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 | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 116 116    
PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 7    
PCI Loans and Leases [Member] | 90 Days or More Past Due | Real estate loans [Member] | Residential property [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 | Commercial and industrial loans [Member] | Commercial term [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 $ 50 $ 50