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Derivatives and hedging activities - Credit-risk-related Contingent Features (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivatives    
Derivative Liability $ 6,085 $ 138
Credit-risk contract    
Derivatives    
Derivative Liability 20 29
Derivative, Collateral, Obligation to Return Cash $ 5,120 $ 0