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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | $ (6,260) | $ (7,646) | $ (5,757) | $ (12,886)
Changes in unrealized gains (losses) included in earnings relating to assets still held | (2,031) | (4,946) | 3,135 | (7,377)
Mortgage banking activities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | (6,249) | (7,640) | (5,737) | (12,869)
Changes in unrealized gains (losses) included in earnings relating to assets still held | (2,036) | (4,947) | 3,126 | (7,386)
Trading gains losses |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Gains (Losses) included in earnings | (11) | (6) | (20) | (17)
Changes in unrealized gains (losses) included in earnings relating to assets still held | $ 5 | $ 1 | $ 9 | $ 9

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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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