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Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | $ (15,769) | $ 14,768 | $ (4,918) | $ 21,855
Interest Income | Interest Rate Contract |  |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | 836 | 523 | 1,206 | 1,259
Mortgage Banking Income | Interest Rate Lock Commitments |  |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | (1,082) | 2,924 | (9,404) | 24,745
Mortgage Banking Income | Forward Commitments |  |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | $ (15,523) | $ 11,321 | $ 3,280 | $ (4,149)

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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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