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Fair value measurement - Gains and losses (realized and unrealized) included in earnings for level 3 assets and liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | $ (4,900) | $ (2,796) | $ (10,793) | $ (10,407)
Changes in unrealized gains (losses) included in earnings relating to assets still held | (2,571) | (377) | (3,261) | (1,807)
Mortgage banking activities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | (4,896) | (2,793) | (10,280) | (10,386)
Changes in unrealized gains (losses) included in earnings relating to assets still held | (2,577) | (381) | (3,279) | (1,828)
Trading account profit (loss) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | (4) | (3) | (13) | (21)
Changes in unrealized gains (losses) included in earnings relating to assets still held | 6 | $ 4 | 18 | $ 21
Provision for credit losses |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | 0 |  | (500) |
Changes in unrealized gains (losses) included in earnings relating to assets still held | $ 0 |  | $ 0 |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and liabilities, Gain (Loss) Included in Earnings + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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