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Other comprehensive income (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Accumulated other comprehensive income loss [Line Items]      
Realized gains (losses) on financial assets measured at fair value through other comprehensive income $ 232,461 $ 5,142  
Interest expense - borrowings and deposits (62,723) (96,732) $ (85,601)
Financial instruments FVH      
Disclosure of Accumulated other comprehensive income loss [Line Items]      
Realized gains (losses) on securities at FVOCI (56) 157 87
Financial instruments CFH      
Disclosure of Accumulated other comprehensive income loss [Line Items]      
Realized gains (losses) on financial assets measured at fair value through other comprehensive income (2,762) (5,008) (5,678)
Interest income - loans at amortized cost (2,337) (3,261) (2,502)
Interest expense - borrowings and deposits 0 (1,733) (1,650)
Net gain (loss) on foreign currency exchange (369) (61) (1,530)
Net gain (loss) on interest rate swaps 0 56 4
Net gain (loss) on cross-currency swaps $ 0 $ (9) $ 0