Quarterly report pursuant to Section 13 or 15(d)

Loans - Loans Receivable (Detail)

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Loans - Loans Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans $ 3,306,479 $ 3,183,316    
Allowance for loans losses (41,026) (42,935)    
Loans receivable, net 3,265,453 3,140,381    
Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 2,986,015 2,845,514    
Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 776,718 740,350    
Real estate loans [Member] | Hospitality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 548,807 543,425    
Real estate loans [Member] | Gas station [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 318,184 323,655    
Real estate loans [Member] | Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 1,058,801 978,661    
Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 27,017 23,387    
Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 256,488 236,036    
Real estate loans [Member] | Commercial property [Member] | Owner occupied real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 1,230,000 1,200,000    
Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 295,632 312,876    
Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 140,720 152,773    
Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 124,962 128,224    
Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 29,950 31,879    
Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 24,832 24,926    
Consumer loans [Member] | Home equity line of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 21,700 21,800    
Non-PCI Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 3,286,644 3,163,302 $ 2,775,616  
Allowance for loans losses (35,381) (37,494) (51,515) $ (51,640)
Loans receivable, net 3,251,263 3,125,808    
Non-PCI Loans [Member] | Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 2,966,390 2,825,718    
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 772,454 735,501    
Non-PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 544,708 539,345    
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 313,571 319,363    
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 1,053,306 973,243    
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 27,017 23,387    
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 255,334 234,879    
Non-PCI Loans [Member] | Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 295,471 312,705    
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 140,559 152,602    
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 124,962 128,224    
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 29,950 31,879    
Non-PCI Loans [Member] | Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 24,783 24,879    
PCI Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 19,835 20,014 40,941  
Allowance for loans losses (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]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 19,625 19,796    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 4,264 4,849    
Allowance for loans losses (421) (269)    
Loans receivable, net 3,843 4,580    
PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 4,099 4,080    
Allowance for loans losses 0 (88)    
Loans receivable, net 4,099 3,992    
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 4,613 4,292    
Allowance for loans losses (484) (477)    
Loans receivable, net 4,129 3,815    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 5,495 5,418    
PCI Loans [Member] | Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 0 0    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 1,154 1,157    
Allowance for loans losses (197) (151)    
Loans receivable, net 957 1,006    
PCI Loans [Member] | Real estate loans [Member] | Commercial property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 18,471 18,639    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 161 171    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 161 171    
Allowance for loans losses (44) (42)    
Loans receivable, net 117 129    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 0 0    
PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 0 0    
PCI Loans [Member] | Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans 49 47    
Allowance for loans losses (2) (2)    
Loans receivable, net $ 47 $ 45