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Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (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
Derivative [Line Items] |  |  |  |
Net fair value gains/(losses) on derivative financial instruments | $ 1,280 | $ 1,796 | $ (1,294) | $ 9,639
Mortgage Banking Derivatives [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains/(losses) on derivative financial instruments | 228 | 1,783 | (2,134) | 9,527
Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains/(losses) on derivative financial instruments | 1,069 | (12) | 861 | 70
Foreign Exchange Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains/(losses) on derivative financial instruments | $ (17) | $ 25 | $ (21) | $ 42

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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