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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | $ 3,022 | $ (381) | $ 3,645 | $ (160)
Interest rate lock with customers [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (155) | 512 | 690 | 1,744
Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 157 | (906) | (2,222) | (2,012)
Interest Rate Swap with Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 13,809 | 20,569 | 12,994 | 50,000
Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (10,831) | (20,569) | (7,830) | (50,000)
Foreign Exchange Contracts With Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (325) | 81 | (317) | 455
Foreign Exchange Contracts With Correspondent Banks [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | $ 367 | $ (68) | $ 330 | $ (347)

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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=64837297&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=64837297&loc=SL5624171-113959 + 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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