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Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - 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
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | $ 30,841 | $ (1,947) | $ 48,136 | $ (10,325)
Interest rate lock with customers [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 355 | 231 | 961 | 360
Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (403) | (541) | (347) | (315)
Interest Rate Swap with Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 81,576 | (12,375) | 132,093 | (55,017)
Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (50,673) | 10,811 | (84,605) | 44,625
Foreign Exchange Contracts With Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (154) | (23) | 65 | (16)
Foreign Exchange Contracts With Correspondent Banks [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 140 | (50) | (31) | 38
Centrally Cleared Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | $ (31,200) | $ 1,600 | $ (47,500) | $ 10,400

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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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