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Derivative instruments and hedging activities - Non-hedging activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives $ (1,244) $ 1,273 $ (923)
Forward contracts | Mortgage banking activities      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives (2,254) 1,213 (1,484)
Interest rate swap | Other operating income      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives 0 0 51
Foreign currency forward contracts | Other operating income      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives 0 0 67
Foreign currency forward contracts | Interest Expense      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives 0 0 (14)
Interest rate cap | Other operating income      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives (5) (4) (48)
Indexed options on deposits | Interest Expense      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives 7,898 114 5,934
Bifurcated embedded options | Interest Expense      
Derivative Instruments, Gain (Loss)      
Amount of net gain (loss) recognized in income on derivatives $ (6,883) $ (50) $ (5,429)