Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Loans - Analysis of Gross Loans, Disaggregated by PCI Loan Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Aug. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans $ 3,183,316 $ 2,788,498    
Allowance Amount 42,935 52,666    
Loans receivable, net 3,140,381 2,735,832    
Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 2,845,514 2,511,429    
Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 543,425 462,718    
Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 323,655 370,416    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 236,036 135,462    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 312,876 249,480    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 152,773 116,536    
Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 24,926 27,589    
PCI Loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 7,205      
Current 12,809      
Total loans 20,014 44,501 $ 65,346  
Allowance Amount 5,441 1,026    
Loans receivable, net 14,573 43,475   $ 0
PCI Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 19,796   64,823  
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 1,376      
Current 3,473      
Total loans 4,849      
Allowance Amount 269      
Loans receivable, net 4,580      
PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 163      
Current 3,917      
Total loans 4,080 7,682    
Allowance Amount 88 99    
Loans receivable, net 3,992 7,583    
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 457      
Current 3,835      
Total loans 4,292 7,745    
Allowance Amount 477 302    
Loans receivable, net 3,815 7,443    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 5,000      
Current 418      
Total loans 5,418 5,796    
Allowance Amount 4,412 65    
Loans receivable, net 1,006 5,731    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 158      
Current 999      
Total loans 1,157 14,371 4,472  
Allowance Amount 151 28    
Loans receivable, net 1,006 14,343    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Total loans 171   506  
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 4      
Current 167      
Total loans 171 327    
Allowance Amount 42 131    
Loans receivable, net 129 196    
PCI Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 47      
Current 0      
Total loans 47 45 $ 17  
Allowance Amount 2 0    
Loans receivable, net 45 $ 45    
PCI Loans [Member] | 30-59 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable 0      
PCI Loans [Member] | 30-59 Days Past Due [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0      
PCI Loans [Member] | 60-89 Days Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable 0      
PCI Loans [Member] | 60-89 Days Past Due [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 0      
PCI Loans [Member] | 90 Days or More Past Due [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable 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 receivable $ 47