Annual report pursuant to Section 13 and 15(d)

Loans - Credit Quality of Loan Portfolio (Detail)

v3.3.1.900
Loans - Credit Quality of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 3,183,316 $ 2,788,498
Real estate loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,845,514 2,511,429
Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 740,350 684,400
Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 543,425 462,718
Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 323,655 370,416
Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 978,661 848,906
Real estate loans [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 23,387 9,527
Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 236,036 135,462
Commercial and industrial loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 312,876 249,480
Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 152,773 116,536
Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 128,224 93,970
Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 31,879 38,974
Consumer loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 24,926 27,589
Non-PCI Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,163,302 2,740,760
Non-PCI Loans [Member] | Pass/Pass-Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,085,409 2,607,886
Non-PCI Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 38,556 85,487
Non-PCI Loans [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 39,337 47,387
Non-PCI Loans [Member] | Real estate loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,825,718  
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 735,501 675,072
Non-PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 539,345 454,499
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 319,363 362,240
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 973,243 842,126
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 23,387 9,517
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 234,879 120,932
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 722,483 654,360
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 517,462 397,437
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 309,598 345,775
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 953,839 822,037
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 23,387 9,517
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 232,862 118,688
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,519 18,013
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 9,604 46,365
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 5,897 8,899
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 8,662 9,543
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 58 66
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,499 2,699
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Hotel/motel [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 12,279 10,697
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Gas station [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 3,868 7,566
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 10,742 10,546
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,959 2,178
Non-PCI Loans [Member] | Commercial and industrial loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 312,705  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 152,602 116,073
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 128,224 93,860
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 31,879 38,929
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 145,773 106,326
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 127,579 92,312
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 29,719 36,121
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,370 1,225
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 195 993
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,160 252
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 4,459 8,522
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial lines of credit [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 450 555
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | International loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 2,556
Non-PCI Loans [Member] | Consumer loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 24,879 27,512
Non-PCI Loans [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 22,707 25,313
Non-PCI Loans [Member] | Consumer loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 91 131
Non-PCI Loans [Member] | Consumer loans [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 2,081 $ 2,068