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Derivative Financial Instruments Fair Value Gains and Losses on Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net fair value gains on derivative financial instruments | $ 2,787 | $ 1,157 | $ 1,507
Centrally Cleared Interest Rate Swap With Counterparty |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives variation margin | 4,600 |  |
Interest rate locks with customers | Mortgage Banking Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on interest rate derivative instruments | 364 | (639) | (110)
Forward Commitments | Mortgage Banking Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on interest rate derivative instruments | (2,290) | 1,930 | 1,345
Interest Rate Swaps with Customers | Other Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on interest rate derivative instruments | (1,872) | (25,461) | 13,342
Interest Rate Swaps with Dealer Counterparties | Other Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on interest rate derivative instruments | 6,576 | 25,461 | (13,342)
Foreign Exchange Contracts with Correspondent Banks | Other Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on foreign currency derivatives | 135 | (487) | 711
Foreign exchange contracts with customers | Other Income |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on foreign currency derivatives | $ (126) | $ 353 | $ (439)

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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 Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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