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Commitments and contingencies Commitments and contingencies - Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Commitments and Contingencies [Roll Forward]        
Balance at beginning of period $ 113,129 $ 31,139    
Balance at end of period 183,973 183,973    
Unfunded Commitments        
Commitments and Contingencies [Roll Forward]        
Balance at beginning of period 6,500 0    
Initial recognition of allowance for credit losses     $ 0 $ 2,947
Increase in allowance for credit losses from unfunded commitments acquired in business combination 10,429 10,499    
Provision for credit losses on unfunded commitments (862) 2,621    
Balance at end of period $ 16,067 $ 16,067