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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 | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) |  |  |
Amount of (Loss) Recognized in OCI Included Component | $ (239) | $ (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 |  |  | $ 212
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 |  | (48) |
Amount of (Loss) Reclassified from Accumulated OCI into Income Excluded Component |  | (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 |  | (48) |
Amount of (Loss) Reclassified from Accumulated OCI into Income Excluded Component |  | $ (48) |

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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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