Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Loans and Leases - Credit Quality of PCI Loan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]        
Total $ 4,304,458 $ 3,844,769    
Allowance Amount 31,043 32,429    
Loans and leases receivable, net 4,273,415 3,812,340    
Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 3,590,914 3,278,375    
Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 915,273 859,953    
Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 681,325 651,158    
Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 521,853 338,767    
Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 399,201 300,220    
Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 182,685 138,168    
Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 17,059 22,880    
PCI Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 7,748 9,863    
Allowance Amount 320 971 $ 5,441  
Loans and leases receivable, net 7,428 8,892 $ 14,573 $ 43,475
PCI Loans [Member] | Pass/Pass-Watch [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,341 1,153    
PCI Loans [Member] | Special Mention [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 328 1,180    
PCI Loans [Member] | Classified [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 6,079 7,530    
PCI Loans [Member] | Real estate loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 7,659 9,677    
Allowance Amount 259 922    
Loans and leases receivable, net 7,400 8,755    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,645 2,324    
Allowance Amount 31 122    
Loans and leases receivable, net 1,614 2,202    
PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,642 1,618    
Allowance Amount 129 138    
Loans and leases receivable, net 1,513 1,480    
PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 3,421 4,759    
Allowance Amount 16 590    
Loans and leases receivable, net 3,405 4,169    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 951 976    
Allowance Amount 83 72    
Loans and leases receivable, net 868 904    
PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,341 1,153    
PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 220 0    
PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 169 177    
PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1 0    
PCI Loans [Member] | Real estate loans [Member] | Pass/Pass-Watch [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 951 976    
PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 328 1,180    
PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 96 0    
PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 232 1,180    
PCI Loans [Member] | Real estate loans [Member] | Special Mention [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Real estate loans [Member] | Classified [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 5,990 7,344    
PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Retail [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,425 2,324    
PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Hotel/motel [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,377 1,441    
PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Other [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 3,188 3,579    
PCI Loans [Member] | Real estate loans [Member] | Classified [Member] | Residential property [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 49 136    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 49 136    
Allowance Amount 41 41    
Loans and leases receivable, net 8 95    
PCI Loans [Member] | Commercial and industrial loans [Member] | Pass/Pass-Watch [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Commercial and industrial loans [Member] | Special Mention [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Commercial and industrial loans [Member] | Classified [Member] | Commercial term [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 49 136    
PCI Loans [Member] | Consumer loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 40 50    
Allowance Amount 20 8    
Loans and leases receivable, net 20 42    
PCI Loans [Member] | Consumer loans [Member] | Pass/Pass-Watch [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Consumer loans [Member] | Special Mention [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total 0 0    
PCI Loans [Member] | Consumer loans [Member] | Classified [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 40 $ 50