Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Credit Quality of PCI Loan (Detail)

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Loans and Leases - Credit Quality of PCI Loan (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable $ 3,943,951 $ 3,844,769    
Allowance 33,152 32,429    
Loans and leases receivable, net 3,910,799 3,812,340    
Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 3,348,875 3,278,375    
Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 909,986 859,953    
Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 652,114 651,158    
Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 256,060 262,879    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 358,745 338,767    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 317,682 300,220    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 135,596 138,168    
Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 17,803 22,880    
PCI Loans and Leases [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 8,960 9,863 $ 19,835  
Allowance 891 971 5,645 $ 5,441
Loans and leases receivable, net 8,069 8,892 $ 14,190 $ 14,573
PCI Loans and Leases [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 8,790 9,677    
PCI Loans and Leases [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,554 2,324    
Allowance 98 122    
Loans and leases receivable, net 1,456 2,202    
PCI Loans and Leases [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,554 2,324    
Allowance   122    
Loans and leases receivable, net   2,202    
PCI Loans and Leases [Member] | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,596 1,618    
Allowance 140 138    
Loans and leases receivable, net 1,456 1,480    
PCI Loans and Leases [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 2,623 2,692    
Allowance 531 589    
Loans and leases receivable, net 2,092 2,103    
PCI Loans and Leases [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 2,047 2,067    
Allowance 0 1    
Loans and leases receivable, net 2,047 2,066    
PCI Loans and Leases [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 970 976    
Allowance 73 72    
Loans and leases receivable, net 897 904    
PCI Loans and Leases [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 120 136    
PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 120 136    
Allowance 41 41    
Loans and leases receivable, net 79 95    
PCI Loans and Leases [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 50 50    
Allowance 8 8    
Loans and leases receivable, net 42 42    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,146 1,153    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0      
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable   0    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 176 177    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 970 976    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Pass/Pass-Watch [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Special Mention [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,164 1,180    
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0      
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable   0    
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,153 1,180    
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Special Mention [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Special Mention [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 11 0    
PCI Loans and Leases [Member] | Special Mention [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Classified [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 6,650 7,530    
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,554      
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable   2,324    
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member] | Hospitality [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,420 1,441    
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member] | Gas station [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 1,470 1,512    
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 2,047 2,067    
PCI Loans and Leases [Member] | Classified [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 0 0    
PCI Loans and Leases [Member] | Classified [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable 109 136    
PCI Loans and Leases [Member] | Classified [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total gross loans and leases receivable $ 50 $ 50