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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Total gains (losses) included in earnings | $ (3,839) | $ (4,900) | $ (9,374) | $ (10,793)
Changes in unrealized gains (losses) relating to assets still held at reporting date | (1,505) | (2,571) | (2,459) | (3,261)
Mortgage banking activities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Total gains (losses) included in earnings | (3,835) | (4,896) | (9,359) | (10,280)
Changes in unrealized gains (losses) relating to assets still held at reporting date | (1,505) | (2,577) | (2,482) | (3,279)
Trading account profit (loss) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Total gains (losses) included in earnings | (4) | (4) | (15) | (13)
Changes in unrealized gains (losses) relating to assets still held at reporting date | $ 0 | 6 | $ 23 | 18
Provision for credit losses |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract |  |  |  |
Total gains (losses) included in earnings |  | 0 |  | (500)
Changes in unrealized gains (losses) relating to assets still held at reporting date |  | $ 0 |  | $ 0

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- Definition Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: 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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