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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases $ 3,844,769 $ 3,183,316    
Allowance Amount 32,429 42,935    
Loans and leases receivable, net 3,812,340 3,140,381    
Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 3,278,375 2,845,514    
Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 651,158 543,425    
Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 262,879 323,655    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 338,767 236,036    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 300,220 312,876    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 138,168 152,773    
Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 22,880 24,926    
PCI Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 1,392 7,205    
Current 8,471 12,809    
Total loans and Leases 9,863 20,014    
Allowance Amount 971 5,441 $ 1,026  
Loans and leases receivable, net 8,892 14,573 $ 43,475 $ 0
PCI Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 9,677 19,796    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 1,035 1,376    
Current 1,289 3,473    
Total loans and Leases 2,324 4,849    
Allowance Amount 122 269    
Loans and leases receivable, net 2,202 4,580    
PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 178 163    
Current 1,440 3,917    
Total loans and Leases 1,618 4,080    
Allowance Amount 138 88    
Loans and leases receivable, net 1,480 3,992    
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 116 457    
Current 2,576 3,835    
Total loans and Leases 2,692 4,292    
Allowance Amount 589 477    
Loans and leases receivable, net 2,103 3,815    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 7 5,000    
Current 2,060 418    
Total loans and Leases 2,067 5,418    
Allowance Amount 1 4,412    
Loans and leases receivable, net 2,066 1,006    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 0 158    
Current 976 999    
Total loans and Leases 976 1,157    
Allowance Amount 72 151    
Loans and leases receivable, net 904 1,006    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans and Leases 136 171    
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 6 4    
Current 130 167    
Total loans and Leases 136 171    
Allowance Amount 41 42    
Loans and leases receivable, net 95 129    
PCI Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 50 47    
Current 0 0    
Total loans and Leases 50 47    
Allowance Amount 8 2    
Loans and leases receivable, net 42 45    
PCI Loans [Member] | 30-59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 975 4    
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 797 0    
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 178 0    
PCI Loans [Member] | 30-59 Days Past Due [Member] | 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 [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 4    
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 0 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 0 276    
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 0 267    
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 0 9    
PCI Loans [Member] | 60-89 Days Past Due [Member] | 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 [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 417 6,925    
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 238 1,109    
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 0 154    
PCI Loans [Member] | 90 Days or More Past Due [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans and leases receivable 116 457    
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 7 4,996    
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 0 158    
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 6 4    
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 $ 50 $ 47