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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 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 | $ (128) | $ (137) | $ (22) | $ 356
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 | 137 | 133 | 405 | 279
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | 137 | 133 | 405 | 279
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component | 153 | 149 | 453 | 327
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component | $ (16) | (16) | (48) | (48)
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 |  | (20) | (48) | 53
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income |  | (20) | (23) | 53
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 |  | $ (20) | $ (48) | $ 53

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