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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 | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI Included Component |  |  | $ 1,108 |  | $ 1,002
Interest expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income |  | $ 73 | (23) | $ 73 |
Interest income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income | $ 134 | $ 110 | 268 | 146 |
Cash Flow Hedge |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative |  |  | 325 | (360) |
Amount of Gain (Loss) Recognized in OCI Included Component |  |  | 318 | (359) |
Amount of Loss Recognized in OCI Excluded Component |  |  | 7 | (1) |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income |  |  | 220 | 219 |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component |  |  | 252 | 251 |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component |  |  | (32) | (32) |
Cash Flow Hedge | Interest expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative |  |  | 401 | (510) |
Amount of Gain (Loss) Recognized in OCI Included Component |  |  | 401 | (510) |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income |  |  | (23) | 73 |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component |  |  | (23) | 73 |
Cash Flow Hedge | Other expense |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income |  |  | (25) |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component |  |  | (25) |  |
Cash Flow Hedge | Interest Rate Floor | Interest income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative |  |  | (76) | 150 |
Amount of Gain (Loss) Recognized in OCI Included Component |  |  | (83) | 151 |
Amount of Loss Recognized in OCI Excluded Component |  |  | 7 | (1) |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income |  |  | 268 | 146 |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component |  |  | 300 | 178 |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component |  |  | $ (32) | $ (32) |

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