Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Analysis of Gross Loans, Disaggregated by PCI Loan Class (Detail)

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Loans and Leases - Analysis of Gross Loans, Disaggregated by PCI Loan Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases $ 4,304,458 $ 3,844,769    
Allowance Amount 31,043 32,429    
Loans and leases receivable, net 4,273,415 3,812,340    
Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 3,590,914 3,278,375    
Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 681,325 651,158    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 521,853 338,767    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 399,201 300,220    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 182,685 138,168    
Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 17,059 22,880    
PCI Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 703 1,392    
Current 7,045 8,471    
Total loans and Leases 7,748 9,863    
Allowance Amount 320 971 $ 5,441  
Loans and leases receivable, net 7,428 8,892 $ 14,573 $ 43,475
PCI Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 698 1,336    
Current 6,961 8,341    
Total loans and Leases 7,659 9,677    
Allowance Amount 259 922    
Loans and leases receivable, net 7,400 8,755    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 434 1,035    
Current 1,211 1,289    
Total loans and Leases 1,645 2,324    
Allowance Amount 31 122    
Loans and leases receivable, net 1,614 2,202    
PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 168 178    
Current 1,474 1,440    
Total loans and Leases 1,642 1,618    
Allowance Amount 129 138    
Loans and leases receivable, net 1,513 1,480    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 96 123    
Current 3,325 4,636    
Total loans and Leases 3,421 4,759    
Allowance Amount 16 590    
Loans and leases receivable, net 3,405 4,169    
PCI Loans [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 951 976    
Total loans and Leases 951 976    
Allowance Amount 83 72    
Loans and leases receivable, net 868 904    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 49 136    
PCI Loans [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 44 130    
Total loans and Leases 49 136    
Allowance Amount 41 41    
Loans and leases receivable, net 8 95    
PCI Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 50    
Current 40 0    
Total loans and Leases 40 50    
Allowance Amount 20 8    
Loans and leases receivable, net 20 42    
PCI Loans [Member] | 30-59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 5 975    
PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 975    
PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 797    
PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 178    
PCI Loans [Member] | 30-59 Days Past Due [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
PCI Loans [Member] | 30-59 Days Past Due [Member] | 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 [Member] | 30-59 Days Past Due [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 5 0    
PCI Loans [Member] | 30-59 Days Past Due [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 168 0    
PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 168 0    
PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 168 0    
PCI Loans [Member] | 60-89 Days Past Due [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due [Member] | 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 [Member] | 60-89 Days Past Due [Member] | 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 [Member] | 60-89 Days Past Due [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
PCI Loans [Member] | 90 Days or More Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 530 417    
PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 530 361    
PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 434 238    
PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 0    
PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 96 123    
PCI Loans [Member] | 90 Days or More Past Due [Member] | 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 [Member] | 90 Days or More Past Due [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 6    
PCI Loans [Member] | 90 Days or More Past Due [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable $ 0 $ 50