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Portfolio loans and allowance for loan losses - Distribution of portfolio loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Distributions of portfolio loans        
Portfolio loans $ 6,687,249 $ 5,568,428    
Allowance for loan losses (53,748) (50,648) $ (53,582) $ (47,795)
Portfolio loans, net 6,633,501 5,517,780    
Net deferred loan origination costs 6,200 5,600    
Net accretable purchase accounting adjustments (20,200) (13,900)    
Commercial Loans        
Distributions of portfolio loans        
Portfolio loans 1,748,368 1,405,106    
Allowance for loan losses (18,291) (17,829) (14,779) (13,303)
Commercial Real Estate Loans        
Distributions of portfolio loans        
Portfolio loans 2,793,417 2,366,823    
Allowance for loan losses (21,190) (21,137) (21,813) (20,623)
Real Estate Construction        
Distributions of portfolio loans        
Portfolio loans 401,861 288,197    
Allowance for loan losses (3,204) (2,723) (2,861) (1,870)
Retail Real Estate        
Distributions of portfolio loans        
Portfolio loans 1,693,769 1,480,133    
Allowance for loan losses (10,495) (8,471) (13,783) (11,648)
Retail Other        
Distributions of portfolio loans        
Portfolio loans 49,834 28,169    
Allowance for loan losses $ (568) $ (488) $ (346) $ (351)