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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | $ 929 | $ (2,016) | $ 769 | $ 870
Interest rate lock with customers [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 178 | 1,041 | 1,922 | 876
Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 970 | (3,183) | (1,042) | (338)
Interest Rate Swap with Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | (1,948) | 18,266 | 48,052 | 17,831
Interest Rate Swap with Counterparty [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 1,948 | (18,266) | (48,052) | (17,831)
Foreign Exchange Contracts With Customer [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | 47 | (197) | 502 | (378)
Foreign Exchange Contracts With Correspondent Banks [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Net fair value gains (losses) on derivative financial instruments | $ (266) | $ 323 | $ (613) | $ 710

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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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