Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Loans - Analysis of Past Due Loans, Disaggregated by Loan Class, PCI (Detail) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans $ 3,045,072   $ 2,788,498    
Allowance 46,360   52,666    
Loans receivable, net 2,998,712   2,735,832    
Real estate loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 2,739,554   2,512,425    
Real estate loans [Member] | Hospitality [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 549,583   468,082    
Real estate loans [Member] | Gas station [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 340,304   370,560    
Real estate loans [Member] | Residential property [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 198,105   123,623    
Commercial and industrial loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 280,784   248,462    
Commercial and industrial loans [Member] | Commercial term [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 121,848   116,061    
Consumer loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 24,734   27,611    
PCI Loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 11,845   31,406    
Current 13,300   13,095    
Total Loans 25,145   44,501    
Allowance 3,138 $ 1,352 1,026    
Loans receivable, net 22,007   43,475 $ 67,024 $ 0
PCI Loans [Member] | Real estate loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 24,909   44,129    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 2,773   6,003    
Current 4,495   4,340    
Total Loans 7,268   10,343    
Allowance 203   401    
Loans receivable, net 7,065   9,942    
PCI Loans [Member] | Real estate loans [Member] | Hospitality [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 1,708   7,982    
Current 3,727   4,880    
Total Loans 5,435   12,862    
Allowance 290   99    
Loans receivable, net 5,145   12,763    
PCI Loans [Member] | Real estate loans [Member] | Gas station [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 1,952   5,370    
Current 3,834   2,375    
Total Loans 5,786   7,745    
Allowance 108   302    
Loans receivable, net 5,678   7,443    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 4,930   10,119    
Current 455   561    
Total Loans 5,385   10,680    
Allowance 2,318   65    
Loans receivable, net 3,067   10,615    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 397   1,722    
Current 638   777    
Total Loans 1,035   2,499    
Allowance 200   28    
Loans receivable, net 835   2,471    
PCI Loans [Member] | Commercial and industrial loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Total Loans 193   327    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 42   165    
Current 151   162    
Total Loans 193   327    
Allowance 17   131    
Loans receivable, net 176   196    
PCI Loans [Member] | Consumer loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 43   45    
Current 0   0    
Total Loans 43   45    
Allowance 2   0    
Loans receivable, net 41   45    
PCI Loans [Member] | 30-59 Days Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 1,110   1,574    
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 1,061   93    
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 0   312    
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 49   1,139    
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 0   0    
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    
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 0   30    
PCI Loans [Member] | 30-59 Days Past Due | Consumer loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 0   0    
PCI Loans [Member] | 60-89 Days Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 84   1,357    
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 65   287    
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 0   0    
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   1,053    
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 0   0    
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    
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 5   0    
PCI Loans [Member] | 60-89 Days Past Due | Consumer loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 14   17    
PCI Loans [Member] | 90 Days or More Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable 10,651   28,475    
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 1,647   5,623    
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 1,708   7,670    
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 1,903   3,178    
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 4,930   10,119    
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 397   1,722    
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 37   135    
PCI Loans [Member] | 90 Days or More Past Due | Consumer loans [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Past due loans receivable $ 29   $ 28