Quarterly report pursuant to Section 13 or 15(d)

Loans - Credit Quality of Loan Portfolio (Detail)

v3.2.0.727
Loans - Credit Quality of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans $ 2,874,172 $ 2,785,261  
Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,586,666 2,508,515  
Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 699,455 685,415  
Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 502,634 467,361  
Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 343,521 369,985  
Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 846,620 852,806  
Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 21,310 9,517  
Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 173,126 123,431  
Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 261,189 249,189  
Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 111,943 116,400  
Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 115,382 93,860  
Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 33,864 38,929  
Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 26,317 27,557  
Non-PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,840,264 2,740,760 $ 2,349,235
Non-PCI Loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,724,993 2,607,886  
Non-PCI Loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 70,513 85,487  
Non-PCI Loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 44,758 47,387  
Non-PCI Loans [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,553,068 2,464,386 2,090,083
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 690,097 675,072  
Non-PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 492,289 454,499  
Non-PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 337,566 362,240  
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 840,735 842,126  
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 21,310 9,517  
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 171,071 120,932  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 676,646 654,360  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 440,360 397,437  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 321,327 345,775  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 823,627 822,037  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 21,310 9,517  
Non-PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 169,287 118,688  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 11,599 18,013  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 41,436 46,365  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 9,515 8,899  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 6,222 9,543  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0 0  
Non-PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 62 66  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,852 2,699  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 10,493 10,697  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 6,724 7,566  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 10,886 10,546  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0 0  
Non-PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,722 2,178  
Non-PCI Loans [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 260,922 248,862 230,309
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 111,676 116,073  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 115,382 93,860  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 33,864 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 gross loans 101,985 106,326  
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 gross loans 112,553 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 gross loans 33,864 36,121  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,373 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 gross 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 gross loans 0 252  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 8,318 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 gross loans 2,634 555  
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | International loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0 2,556  
Non-PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 26,274 27,512 $ 28,843
Non-PCI Loans [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 24,034 25,313  
Non-PCI Loans [Member] | Consumer loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 111 131  
Non-PCI Loans [Member] | Consumer loans [Member] | Classified [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans $ 2,129 $ 2,068