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
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans $ 2,874,172   $ 2,785,261
Allowance 50,820   52,666
Loans receivable, net 2,826,086   2,735,832
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
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
Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 26,317   27,557
PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 33,908   44,501
Allowance 1,352 $ 1,436 1,026
Loans receivable, net 32,556   43,475
PCI Loans [Member] | Real estate loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 33,598   44,129
Allowance 1,289 1,318 895
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 9,358   10,343
Allowance 257   401
Loans receivable, net 9,101   9,942
PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 10,345   12,862
Allowance 317   99
Loans receivable, net 10,028   12,763
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 5,955   7,745
Allowance 503   302
Loans receivable, net 5,452   7,443
PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 5,885   10,680
Allowance 16   65
Loans receivable, net 5,869   10,615
PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,055   2,499
Allowance 196   28
Loans receivable, net 1,859   2,471
PCI Loans [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 267   327
Allowance 63 118 131
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 267   327
Allowance 63   131
Loans receivable, net 204   196
PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 43   45
Allowance 0 $ 0 0
Loans receivable, net 43   45
Pass/Pass-Watch [Member] | PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,441   1,207
Pass/Pass-Watch [Member] | PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 1,199   1,207
Pass/Pass-Watch [Member] | PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 191   0
Pass/Pass-Watch [Member] | PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Pass/Pass-Watch [Member] | PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 51   0
Pass/Pass-Watch [Member] | PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Pass/Pass-Watch [Member] | PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Pass/Pass-Watch [Member] | PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Special Mention [Member] | PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 365   1,461
Special Mention [Member] | PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 177   219
Special Mention [Member] | PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Special Mention [Member] | PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 188   1,242
Special Mention [Member] | PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Special Mention [Member] | PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Special Mention [Member] | PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Special Mention [Member] | PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 0   0
Classified [Member] | PCI Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 32,102   41,833
Classified [Member] | PCI Loans [Member] | Real estate loans [Member] | Retail [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 7,982   8,917
Classified [Member] | PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 10,154   12,862
Classified [Member] | PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 5,767   6,503
Classified [Member] | PCI Loans [Member] | Real estate loans [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 5,834   10,680
Classified [Member] | PCI Loans [Member] | Real estate loans [Member] | Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 2,055   2,499
Classified [Member] | PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans 267   327
Classified [Member] | PCI Loans [Member] | Consumer loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total gross loans $ 43   $ 45