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Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - 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
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | $ 904 | $ 400 | $ 1,699 | $ 466
Mortgage Banking Derivatives [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | 843 | 441 | 1,457 | 486
Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | 51 | 18 | 198 | 17
Foreign Exchange Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | $ 10 | $ (59) | $ 44 | $ (37)

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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