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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ 2,144 | $ 725 | $ 5,190 | $ (204)
Interest rate contracts | Included in interest income on loans |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | 1,042 | 1,652 | 3,066 | 3,021
Interest rate lock commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | (1,737) | (441) | 209 | 874
Forward commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ 2,839 | $ (486) | $ 1,915 | $ (4,099)

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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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