Quarterly report pursuant to Section 13 or 15(d)

Loans - Credit Quality of PCI Loan (Detail)

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Loans - Credit Quality of PCI Loan (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans $ 3,552,659   $ 3,183,316      
Allowance 38,972   42,935      
Loans receivable, net 3,513,687   3,140,381      
Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 3,210,687   2,845,514      
Real estate loans [Member] | Retail [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 822,074   740,350      
Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 622,280   543,425      
Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 274,385   323,655      
Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 330,675   236,036      
Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 319,656   312,876      
Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 144,889   152,773      
Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 22,316   24,926      
PCI Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 15,540   20,014 $ 25,145    
Allowance 5,533 $ 5,448 5,441 3,138 $ 1,352 $ 1,026
Loans receivable, net 10,007   14,573 $ 22,007   $ 43,475
PCI Loans [Member] | Real estate loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 15,355   19,796      
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 2,470   4,849      
Allowance 282   269      
Loans receivable, net 2,188   4,580      
PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 3,925   4,080      
Allowance 52   88      
Loans receivable, net 3,873   3,992      
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 2,833   4,292      
Allowance 575   477      
Loans receivable, net 2,258   3,815      
PCI Loans [Member] | Real estate loans [Member] | Other [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 5,147   5,418      
Allowance 4,495   4,412      
Loans receivable, net 652   1,006      
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 980   1,157      
Allowance 80   151      
Loans receivable, net 900   1,006      
PCI Loans [Member] | Commercial and industrial loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 135   171      
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 135   171      
Allowance 42   42      
Loans receivable, net 93   129      
PCI Loans [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 50   47      
Allowance 7   2      
Loans receivable, net 43   45      
PCI Loans [Member] | Pass/Pass-Watch [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 1,159   1,185      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Retail [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 0   0      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 179   186      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 0   0      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Other [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 0   0      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 980   999      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 0   0      
PCI Loans [Member] | Pass/Pass-Watch [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 0   0      
PCI Loans [Member] | Special Mention [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 1,164   176      
PCI Loans [Member] | Special Mention [Member] | Real estate loans [Member] | Retail [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans     0      
PCI Loans [Member] | Special Mention [Member] | Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans     0      
PCI Loans [Member] | Special Mention [Member] | Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 1,164   176      
PCI Loans [Member] | Special Mention [Member] | Real estate loans [Member] | Other [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans     0      
PCI Loans [Member] | Special Mention [Member] | Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans     0      
PCI Loans [Member] | Special Mention [Member] | Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans     0      
PCI Loans [Member] | Special Mention [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans     0      
PCI Loans [Member] | Classified [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 13,217   18,653      
PCI Loans [Member] | Classified [Member] | Real estate loans [Member] | Retail [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 2,470   4,849      
PCI Loans [Member] | Classified [Member] | Real estate loans [Member] | Hospitality [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 3,746   3,894      
PCI Loans [Member] | Classified [Member] | Real estate loans [Member] | Gas station [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 1,669   4,116      
PCI Loans [Member] | Classified [Member] | Real estate loans [Member] | Other [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 5,147   5,418      
PCI Loans [Member] | Classified [Member] | Real estate loans [Member] | Residential property [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 0   158      
PCI Loans [Member] | Classified [Member] | Commercial and industrial loans [Member] | Commercial term [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans 135   171      
PCI Loans [Member] | Classified [Member] | Consumer loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Total gross loans $ 50   $ 47