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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | $ 1,123 | $ 929 | $ 4,768 | $ 769
Interest rate lock with customers [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | (59) | 178 | 631 | 1,922
Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | (48) | 970 | (2,270) | (1,042)
Interest Rate Swap with Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | (47) | (1,948) | 12,947 | 48,052
Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | 1,248 | 1,948 | (6,582) | (48,052)
Foreign Exchange Contracts With Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | 140 | 47 | (177) | 502
Foreign Exchange Contracts With Correspondent Banks [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains on derivative financial instruments | $ (111) | $ (266) | $ 219 | $ (613)

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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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- 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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