Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Loans Receivable (Detail)

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Loans and Leases - Loans Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable $ 4,413,557 $ 4,304,458    
Allowance for loan and lease losses (31,777) (31,043)    
Loans and leases receivable, net 4,381,780 4,273,415    
Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 3,667,797 3,590,914    
Real estate loans [Member] | Commercial property loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 3,064,848 3,013,871    
Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 909,414 915,273    
Real estate loans [Member] | Hospitality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 731,531 681,325    
Real estate loans [Member] | Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 1,423,903 1,417,273    
Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 57,896 55,190    
Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 545,053 521,853    
Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 409,380 399,201    
Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 184,083 182,685    
Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 190,255 181,894    
Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 35,042 34,622    
Leases Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 321,481 297,284    
Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 14,899 17,059    
Non-PCI Loans and Leases [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 4,413,557 4,304,458 $ 3,943,951  
Allowance for loan and lease losses (31,777) (31,043) $ (33,152) $ (32,429)
Non-PCI Loans and Leases [Member] | Real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 3,667,797 3,590,914    
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Retail [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 909,414 915,273    
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Hospitality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 731,531 681,325    
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 57,896 55,190    
Non-PCI Loans and Leases [Member] | Real estate loans [Member] | Residential property [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 545,053 521,853    
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 409,380 399,201    
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial term [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 184,083 182,685    
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | Commercial lines of credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 190,255 181,894    
Non-PCI Loans and Leases [Member] | Commercial and industrial loans [Member] | International loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 35,042 34,622    
Non-PCI Loans and Leases [Member] | Leases Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable 321,481 297,284    
Non-PCI Loans and Leases [Member] | Consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total gross loans and leases receivable $ 14,899 $ 17,059