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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Recurring |  |  |
Assets |  |  |
Trading Securities Debt | $ 30,836 |  | $ 31,568
Recurring | CMO |  |  |
Assets |  |  |
Trading Securities Debt | 132 |  | 98
Recurring | Other |  |  |
Assets |  |  |
Trading Securities Debt | 154 |  | 167
Recurring | Level 3 |  |  |
Assets |  |  |
Trading Securities Debt | 238 |  | 284
Recurring | Level 3 | CMO |  |  |
Assets |  |  |
Trading Securities Debt | 0 | $ 10 | 5
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum |  |  |
Unobservable inputs |  |  |
Weighted average life (in years) |  | 2 months 12 days |
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum |  |  |
Unobservable inputs |  |  |
Weighted average life (in years) |  | 3 months 18 days |
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average |  |  |
Unobservable inputs |  |  |
Weighted average life (in years) |  | 2 months 12 days |
Yield |  | 4.90% |
Weighted average prepayment speed (annual rate) |  | 7.30% |
Recurring | Level 3 | Other |  |  |
Assets |  |  |
Trading Securities Debt | $ 154 | $ 188 | $ 167
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach | Weighted Average |  |  |
Unobservable inputs |  |  |
Weighted average life (in years) | 2 years 3 months 18 days | 2 years 6 months |
Yield | 12.00% | 12.00% |
Weighted average prepayment speed (annual rate) | 10.80% | 10.80% |
Nonrecurring | Level 3 | Loans held in portfolio |  |  |
Assets |  |  |
Loans | $ 4,166 | $ 9,044 |
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Minimum |  |  |
Unobservable inputs |  |  |
Haircut applied on external appraisal | 5.00% | 5.00% |
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Maximum |  |  |
Unobservable inputs |  |  |
Haircut applied on external appraisal | 10.00% | 10.00% |
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Weighted Average |  |  |
Unobservable inputs |  |  |
Haircut applied on external appraisal | 7.50% | 7.20% |
Nonrecurring | Level 3 | Other real estate owned |  |  |
Assets |  |  |
Other real estate owned | $ 16 | $ 325 |
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average |  |  |
Unobservable inputs |  |  |
Haircut applied on external appraisal | 35.00% | 35.00% |

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