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Loans Receivable and Allowance for Loan Losses - Schedule of Accounts, Notes, Loans and Financing Receivable (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Real estate loans:        
Loans $ 6,375,001 $ 6,251,371    
Less: deferred loan fees (3,066) (3,030)    
Loans receivable 6,371,935 6,248,341    
Less: allowance for loan losses (76,856) (76,408) $ (69,594) $ (67,758)
Loans receivable, net of allowance for loan losses $ 6,295,079 6,171,933    
Number of portfolio segments | segment 4      
Real estate loans        
Real estate loans:        
Loans $ 5,132,517 5,069,482    
Real estate loans | Residential        
Real estate loans:        
Loans 32,390 33,797    
Less: allowance for loan losses (221) (230)    
Real estate loans | Commercial & industrial        
Real estate loans:        
Loans 4,957,751 4,912,655    
Less: allowance for loan losses (53,466) (54,505)    
Real estate loans | Construction        
Real estate loans:        
Loans 142,376 123,030    
Less: allowance for loan losses (1,054) (917)    
Commercial business        
Real estate loans:        
Loans 1,032,078 980,153    
Less: allowance for loan losses (19,202) (16,547)    
Trade finance        
Real estate loans:        
Loans 86,342 99,163    
Less: allowance for loan losses (2,085) (3,592)    
Consumer and other        
Real estate loans:        
Loans 124,064 102,573    
Less: allowance for loan losses $ (828) $ (617)