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Derivatives (Effects of Derivative Instruments on the Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative income reflected in income statement | $ (638) | $ 1,389 | $ 262 | $ 4,882
Interest Rate Swaps [Member] | Interest Income [Member] | Cash Flow Hedge [Member] |  |  |  |
Derivative income reflected in income statement | (1,276) | (126) | (2,841) | (222)
Interest Rate Swaps [Member] | Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative income reflected in income statement | (725) | 176 | (1,371) | 620
All Other Instruments [Member] |  |  |  |
Derivative income reflected in income statement | $ 1,363 | $ 1,339 | $ 4,474 | $ 4,484

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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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