Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Loans Receivable (Detail)

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Loans and Leases - Loans Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases $ 4,304,458 $ 3,844,769    
Allowance for loan and lease losses (31,043) (32,429)    
Loans and leases receivable, net 4,273,415 3,812,340    
Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,590,914 3,278,375    
Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 915,273 859,953    
Real estate loans [Member] | Hotel/motel [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 681,325 651,158    
Real estate loans [Member] | Commercial Real Estate Other, Including Gas Stations [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,417,273 1,372,535    
Real estate loans [Member] | Commercial property loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,013,871 2,883,646    
Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 55,190 55,962    
Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 521,853 338,767    
Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 399,201 300,220    
Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 182,685 138,168    
Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 181,894 136,231    
Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 34,622 25,821    
Leases Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 297,284 243,294    
Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 17,059 22,880    
Home Equity Line of Credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 14,200 17,700    
Non-PCI Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 4,296,710 3,834,906    
Allowance for loan and lease losses (30,723) (31,458) $ (37,494)  
Loans and leases receivable, net 4,265,987 3,803,448    
Non-PCI Loans [Member] | Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,583,255 3,268,698    
Non-PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 913,628 857,629    
Non-PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 679,683 649,540    
Non-PCI Loans [Member] | Real estate loans [Member] | Commercial Real Estate Other, Including Gas Stations [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,413,852 1,367,776    
Non-PCI Loans [Member] | Real estate loans [Member] | Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,413,852 1,367,776    
Non-PCI Loans [Member] | Real estate loans [Member] | Commercial property loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,007,163 2,874,945    
Non-PCI Loans [Member] | Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 55,190 55,962    
Non-PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 520,902 337,791    
Non-PCI Loans [Member] | Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 399,152 300,084    
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 182,636 138,032    
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 181,894 136,231    
Non-PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 34,622 25,821    
Non-PCI Loans [Member] | Leases Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 297,284 243,294    
Non-PCI Loans [Member] | Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 17,019 22,830    
PCI Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 7,748 9,863    
Allowance for loan and lease losses (320) (971) (5,441)  
Loans and leases receivable, net 7,428 8,892 $ 14,573 $ 43,475
PCI Loans [Member] | Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 7,659 9,677    
Allowance for loan and lease losses (259) (922)    
Loans and leases receivable, net 7,400 8,755    
PCI Loans [Member] | Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,645 2,324    
Allowance for loan and lease losses (31) (122)    
Loans and leases receivable, net 1,614 2,202    
PCI Loans [Member] | Real estate loans [Member] | Hotel/motel [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 1,642 1,618    
Allowance for loan and lease losses (129) (138)    
Loans and leases receivable, net 1,513 1,480    
PCI Loans [Member] | Real estate loans [Member] | Commercial Real Estate Other, Including Gas Stations [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 3,421 4,759    
PCI Loans [Member] | Real estate loans [Member] | Commercial property loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 6,708 8,701    
PCI Loans [Member] | Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
PCI Loans [Member] | Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 951 976    
Allowance for loan and lease losses (83) (72)    
Loans and leases receivable, net 868 904    
PCI Loans [Member] | Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 49 136    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 49 136    
Allowance for loan and lease losses (41) (41)    
Loans and leases receivable, net 8 95    
PCI Loans [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
PCI Loans [Member] | Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
PCI Loans [Member] | Leases Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 0 0    
PCI Loans [Member] | Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans and leases 40 50    
Allowance for loan and lease losses (20) (8)    
Loans and leases receivable, net $ 20 $ 42