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Derivative Instruments - Gains (Losses) On Derivative Financial Instruments (Details) - Not designated as hedging instruments: - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ 1,744 | $ (212) | $ 4,913 | $ 3,046
Interest rate contracts | Included in interest income on loans |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | 989 | 1,038 | 2,035 | 2,024
Interest rate lock commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | 2,176 | (238) | 3,398 | 1,946
Forward commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ (1,421) | $ (1,012) | $ (520) | $ (924)

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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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