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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain Recognized in OCI Included Component |  | $ 246
Amount of Gain Recognized in OCI Included Component | $ 441 |
Interest income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Loss Reclassified from Accumulated OCI into Income | 26 | (3)
Cash Flow Hedge | Interest Rate Floor | Interest income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Loss Recognized in OCI on Derivative | 192 | 243
Amount of Gain Recognized in OCI Included Component |  | 109
Amount of Gain Recognized in OCI Included Component | 196 |
Amount of Gain Recognized in OCI Excluded Component | (4) | 134
Amount of Loss Reclassified from Accumulated OCI into Income | 26 | (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  | 13
Amount of Gain Reclassified from Accumulated OCI into Income Included Component | 42 |
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component | $ (16) | $ (16)

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge excluded in assessment of hedge effectiveness. + References No definition available. + Details
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