Quarterly report pursuant to Section 13 or 15(d)

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

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Loans - Analysis of Past Due Loans, Disaggregated by Loan Class, Non-PCI (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans $ 3,449,310 $ 3,183,316  
Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 3,131,572 2,845,514  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 606,076 543,425  
Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 280,761 323,655  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 26,382 23,387  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 296,496 236,036  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 293,073 312,876  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 143,633 152,773  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 121,326 128,224  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 28,114 31,879  
Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 24,665 24,926  
30-59 Days Past Due | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Non-PCI Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 11,307 15,374  
Current 3,422,983 3,147,928  
Total Loans 3,434,290 3,163,302 $ 2,840,264
Non-PCI Loans [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 3,116,749 2,825,718  
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 682 1,183  
Current 790,286 734,318  
Total Loans 790,968 735,501  
Non-PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 2,386 5,139  
Current 600,440 534,206  
Total Loans 602,826 539,345  
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 4,286 2,882  
Current 273,587 316,481  
Total Loans 277,873 319,363  
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 3,220 3,441  
Current 1,119,975 969,802  
Total Loans 1,123,195 973,243  
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Current 26,382 23,387  
Total Loans 26,382 23,387  
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 104 396  
Current 295,401 234,483  
Total Loans 295,505 234,879  
Non-PCI Loans [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Loans 292,927 312,705  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 606 1,131  
Current 142,881 151,471  
Total Loans 143,487 152,602  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 23 450  
Current 121,303 127,774  
Total Loans 121,326 128,224  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 497  
Current 28,114 31,382  
Total Loans 28,114 31,879  
Non-PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 255  
Current 24,614 24,624  
Total Loans 24,614 24,879  
Non-PCI Loans [Member] | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 2,597 4,522  
Non-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 343 441  
Non-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 1,690 1,250  
Non-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 0 959  
Non-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 452 1,144  
Non-PCI Loans [Member] | 30-59 Days Past Due | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Non-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  
Non-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 112 420  
Non-PCI Loans [Member] | 30-59 Days Past Due | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 58  
Non-PCI Loans [Member] | 30-59 Days Past Due | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 250  
Non-PCI Loans [Member] | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 1,512 2,214  
Non-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 0 343  
Non-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 569 49  
Non-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 0 406  
Non-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 893 661  
Non-PCI Loans [Member] | 60-89 Days Past Due | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Non-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  
Non-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 50 253  
Non-PCI Loans [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Non-PCI Loans [Member] | 60-89 Days Past Due | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 497  
Non-PCI Loans [Member] | 60-89 Days Past Due | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 5  
Non-PCI Loans [Member] | 90 Days or More Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 7,198 8,638  
Non-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 339 399  
Non-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 127 3,840  
Non-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 4,286 1,517  
Non-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 1,875 1,636  
Non-PCI Loans [Member] | 90 Days or More Past Due | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Non-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 104 396  
Non-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 444 458  
Non-PCI Loans [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 23 392  
Non-PCI Loans [Member] | 90 Days or More Past Due | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable 0 0  
Non-PCI Loans [Member] | 90 Days or More Past Due | Consumer loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past due loans receivable $ 0 $ 0