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Portfolio loans and allowance for loan losses - Distribution of portfolio loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Distributions of portfolio loans        
Portfolio loans $ 6,745,499 $ 6,687,249    
Allowance for loan losses (84,384) (53,748) $ (50,915) $ (50,648)
Portfolio loans, net 6,661,115 6,633,501    
Net deferred loan origination costs 6,400 6,200    
Net accretable purchase accounting adjustments 17,700 20,200    
Commercial Loans        
Distributions of portfolio loans        
Portfolio loans 1,767,191 1,748,368    
Allowance for loan losses (22,725) (18,291) (17,998) (17,829)
Commercial Real Estate Loans        
Distributions of portfolio loans        
Portfolio loans 2,825,003 2,793,417    
Allowance for loan losses (35,967) (21,190) (20,097) (21,137)
Real Estate Construction        
Distributions of portfolio loans        
Portfolio loans 448,313 401,861    
Allowance for loan losses (7,193) (3,204) (2,807) (2,723)
Retail Real Estate        
Distributions of portfolio loans        
Portfolio loans 1,656,628 1,693,769    
Allowance for loan losses (17,454) (10,495) (9,503) (8,471)
Loans purchased 43,900      
Retail Other        
Distributions of portfolio loans        
Portfolio loans 48,364 49,834    
Allowance for loan losses $ (1,045) $ (568) $ (510) $ (488)