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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - Impaired Loans - Level 3 - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured at fair value | $ 4,740 | $ 220
Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 22.80% | 21.60%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 82.40% | 97.00%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 63.60% | 77.70%
Range and weighted average of liquidation expenses | 5.20% | 4.90%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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