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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on the Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss)        
Total amounts of income and expense line items presented in the statements of income and comprehensive income in which the effects of fair value or cash flow hedges are recorded $ (135) $ (543) $ 106 $ 493
Interest income        
Derivative Instruments, Gain (Loss)        
Total amounts of income and expense line items presented in the statements of income and comprehensive income in which the effects of fair value or cash flow hedges are recorded 134 110 268 146
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 134 110 268 146
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component 150 126 300 178
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component $ (16) (16) (32) (32)
Interest expense        
Derivative Instruments, Gain (Loss)        
Total amounts of income and expense line items presented in the statements of income and comprehensive income in which the effects of fair value or cash flow hedges are recorded   73 (48) 73
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income   73 (23) 73
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring     (25)  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component   $ 73 $ (48) $ 73