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Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |
Net fair value gains (losses) on derivative financial instruments | $ 5,056 | $ 831 | $ (822)
Mortgage Banking Derivatives |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net fair value gains (losses) on derivative financial instruments | 4,974 | 689 | (748)
Interest Rate Swap |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net fair value gains (losses) on derivative financial instruments | 70 | 122 | 1
Foreign Exchange Contract |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net fair value gains (losses) on derivative financial instruments | $ 12 | $ 20 | $ (75)

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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=121590274&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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