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Derivative Instruments - Gains (Losses) On Derivative Financial Instruments (Details) - Not designated as hedging instruments: - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Derivatives, Fair Value [Line Items] |  |
Gains (losses) on derivative financial instruments | $ 38,027 | $ 3,169
Interest rate contracts | Included in interest income on loans |  |
Derivatives, Fair Value [Line Items] |  |
Gains (losses) on derivative financial instruments | 736 | 1,046
Interest rate lock commitments | Included in mortgage banking income |  |
Derivatives, Fair Value [Line Items] |  |
Gains (losses) on derivative financial instruments | 21,821 | 1,222
Forward commitments | Included in mortgage banking income |  |
Derivatives, Fair Value [Line Items] |  |
Gains (losses) on derivative financial instruments | $ 15,470 | $ 901

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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=109980867&loc=SL5618551-113959 + Details
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