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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 | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 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 | $ (728) | $ (322) | $ 315
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component | $ (64) | $ (64) |
Derivative, Excluded Component, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest and Dividend Income, Operating | Interest and Dividend Income, Operating |
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 | $ 212 | $ 543 |
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | 212 | 543 |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component | $ 276 | 607 |
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 |  | (48) |
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income |  | (23) |
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 |  | $ (48) |

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- Definition Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121577181&loc=SL110061172-113977 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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