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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | $ (5,988) | $ (20,501) | $ (11,745) | $ (33,387)
Changes in unrealized gains (losses) included in earnings relating to assets still held | (1,908) | (7,892) | 1,226 | (15,265)
Mortgage banking activities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | (5,979) | (20,491) | (11,716) | (33,360)
Changes in unrealized gains (losses) included in earnings relating to assets still held | (1,912) | (7,892) | 1,214 | (15,278)
Trading gains losses |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | (9) | (10) | (29) | (27)
Changes in unrealized gains (losses) included in earnings relating to assets still held | $ 4 | $ 0 | $ 12 | $ 13

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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