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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
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Mar. 31, 2020 | Mar. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |
Gains (Losses) included in earnings | $ (5,240) | $ (3,832)
Change in unrealized gain loss - Fair value assets | (2,432) | (744)
Mortgage banking activities |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |
Gains (Losses) included in earnings | (5,229) | (3,825)
Change in unrealized gain loss - Fair value assets | (2,439) | (747)
Trading gains losses |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |
Gains (Losses) included in earnings | (11) | (7)
Change in unrealized gain loss - Fair value assets | $ 7 | $ 3

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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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