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Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | $ 13,267 | $ 7,060 | $ 1,847
Interest Income | Interest Rate Contract |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | 2,051 | 3,672 | 4,137
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 | 15,249 | 882 | 779
Mortgage Banking Income | Forward Commitments |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | $ (4,033) | $ 2,506 | $ (3,069)

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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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