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Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | $ 17,295 | $ (8,378)
Interest rate lock with customers [Member] |  |
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | 606 | 129
Forward Commitments [Member] |  |
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | 56 | 226
Interest Rate Swap with Customer [Member] |  |
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | 50,517 | (42,642)
Interest Rate Swap with Counterparty [Member] |  |
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | (33,932) | 33,814
Foreign Exchange Contracts With Customer [Member] |  |
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | 219 | 7
Foreign Exchange Contracts With Correspondent Banks [Member] |  |
Derivative [Line Items] |  |
Net fair value gains (losses) on derivative financial instruments | (171) | 88
Centrally Cleared Interest Rate Swap with Counterparty [Member] |  |
Derivative [Line Items] |  |
Derivatives variation margin | $ 16,300 | $ (8,900)

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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 Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + 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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