Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Loans - Analysis of Past Due Loans, Disaggregated by Loan Class, PCI (Detail) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans $ 3,306,479 $ 3,183,316    
Allowance 41,026 42,935    
Loans receivable, net 3,265,453 3,140,381    
Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 2,986,015 2,845,514    
Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 548,807 543,425    
Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 318,184 323,655    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 256,488 236,036    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 295,632 312,876    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 140,720 152,773    
Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 24,832 24,926    
PCI Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 7,960 7,205    
Current 11,875 12,809    
Total Loans 19,835 20,014 $ 40,941  
Allowance 5,645 5,441 1,436 $ 1,026
Loans receivable, net 14,190 14,573 $ 39,505 $ 43,475
PCI Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 19,625 19,796    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 2,156 1,376    
Current 2,108 3,473    
Total Loans 4,264 4,849    
Allowance 421 269    
Loans receivable, net 3,843 4,580    
PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 160 163    
Current 3,939 3,917    
Total Loans 4,099 4,080    
Allowance 0 88    
Loans receivable, net 4,099 3,992    
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 450 457    
Current 4,163 3,835    
Total Loans 4,613 4,292    
Allowance 484 477    
Loans receivable, net 4,129 3,815    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 4,981 5,000    
Current 514 418    
Total Loans 5,495 5,418    
Allowance 4,497 4,412    
Loans receivable, net 998 1,006    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 158 158    
Current 996 999    
Total Loans 1,154 1,157    
Allowance 197 151    
Loans receivable, net 957 1,006    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total Loans 161 171    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 6 4    
Current 155 167    
Total Loans 161 171    
Allowance 44 42    
Loans receivable, net 117 129    
PCI Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 49 47    
Current 0 0    
Total Loans 49 47    
Allowance 2 2    
Loans receivable, net 47 45    
PCI Loans [Member] | 30-59 Days Past Due        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 978 4    
PCI Loans [Member] | 30-59 Days Past Due | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 978 0    
PCI Loans [Member] | 30-59 Days Past Due | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [Member] | 30-59 Days Past Due | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [Member] | 30-59 Days Past Due | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 4    
PCI Loans [Member] | 30-59 Days Past Due | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [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 receivable 0 0    
PCI Loans [Member] | 30-59 Days Past Due | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 73 276    
PCI Loans [Member] | 60-89 Days Past Due | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 61 267    
PCI Loans [Member] | 60-89 Days Past Due | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 9    
PCI Loans [Member] | 60-89 Days Past Due | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0 0    
PCI Loans [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 receivable 0 0    
PCI Loans [Member] | 60-89 Days Past Due | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 12 0    
PCI Loans [Member] | 90 Days or More Past Due        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 6,909 6,925    
PCI Loans [Member] | 90 Days or More Past Due | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 1,117 1,109    
PCI Loans [Member] | 90 Days or More Past Due | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 160 154    
PCI Loans [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 receivable 450 457    
PCI Loans [Member] | 90 Days or More Past Due | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 4,981 4,996    
PCI Loans [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 receivable 158 158    
PCI Loans [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 receivable 6 4    
PCI Loans [Member] | 90 Days or More Past Due | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable $ 37 $ 47