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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain (Loss) Recognized in OCI Included Component |  | $ (1,056) |  | $ (871)
Amount of (Loss) Reclassified from Accumulated OCI into Income |  |  | $ (48) |
Interest income |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of (Loss) Reclassified from Accumulated OCI into Income | $ (16) |  |  |
Cash Flow Hedge |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of (Loss) Recognized in OCI on Derivative |  |  | (1) |
Amount of (Loss) Recognized in OCI Excluded Component |  |  | (1) |
Amount of (Loss) Reclassified from Accumulated OCI into Income | (16) |  | (48) |
Amount of (Loss) Reclassified from Accumulated OCI into Income Excluded Component | (16) |  | (48) |
Cash Flow Hedge | Interest rate products | Interest income |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of (Loss) Recognized in OCI on Derivative |  |  | (1) |
Amount of (Loss) Recognized in OCI Excluded Component |  |  | (1) |
Amount of (Loss) Reclassified from Accumulated OCI into Income | (16) |  | (48) |
Amount of (Loss) Reclassified from Accumulated OCI into Income Excluded Component | $ (16) |  | $ (48) |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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- Definition The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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