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Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Not Designated as Hedging Instrument - 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
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | $ 2,648 | $ 2,070 | $ (2,270) | $ 23,925
Interest Income | Interest Rate Contract |  |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | 589 | 451 | 1,795 | 1,710
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 | (3,251) | (1,135) | (12,655) | 23,610
Mortgage Banking Income | Forward Commitments |  |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |  |
Gains (losses) on derivative financial instruments | $ 5,310 | $ 2,754 | $ 8,590 | $ (1,395)

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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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