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Derivative Instruments - Gains (Losses) of Derivative Instruments (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | $ 7,060 | $ 1,847 | $ (152)
Included in interest income on loans | Interest rate contracts |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | 3,672 | 4,137 | 3,981
Included in 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 | 882 | 779 | 356
Included in mortgage banking income | Forward commitments |  |  |
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income |  |  |
Gains (losses) on derivative financial instruments | $ 2,506 | $ (3,069) | $ (4,489)

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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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