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Derivative Instruments - Gains (Losses) On Derivative Financial Instruments (Details) - Not designated as hedging instruments: - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ 4,032 | $ 2,144 | $ 8,945 | $ 5,190
Interest rate contracts | Included in interest income on loans |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | 950 | 1,042 | 2,985 | 3,066
Interest rate lock commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | (444) | (1,737) | 2,954 | 209
Forward commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ 3,526 | $ 2,839 | $ 3,006 | $ 1,915

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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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