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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | $ (1,947) | $ 3,022 | $ (10,325) | $ 3,645
Interest rate lock with customers [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | 231 | (155) | 360 | 690
Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | (541) | 157 | (315) | (2,222)
Interest Rate Swap with Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | (12,375) | 13,809 | (55,017) | 12,994
Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | 10,811 | (10,831) | 44,625 | (7,830)
Foreign Exchange Contracts With Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | (23) | (325) | (16) | (317)
Foreign Exchange Contracts With Correspondent Banks [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | (50) | 367 | 38 | 330
Centrally Cleared Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value (losses) gains on derivative financial instruments | $ 1,600 | $ 2,900 | $ 10,400 | $ 5,100

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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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