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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ (212) | $ 1,408 | $ 3,046 | $ (929)
Interest rate contracts | Included in interest income on loans |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | 1,038 | 690 | 2,024 | 1,369
Interest rate lock commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | (238) | (1,538) | 1,946 | 1,315
Forward commitments | Included in mortgage banking income |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) on derivative financial instruments | $ (1,012) | $ 2,256 | $ (924) | $ (3,613)

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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