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Derivatives (Effects of Derivative Instruments on the Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative income reflected in income statement | $ 123 | $ 2,773 | $ 900 | $ 3,493
Interest Rate Swaps [Member] | Interest Income [Member] | Cash Flow Hedge [Member] |  |  |  |
Derivative income reflected in income statement | (946) | (210) | (1,565) | (96)
Interest Rate Swaps [Member] | Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative income reflected in income statement | (519) | 303 | (646) | 444
All Other Instruments [Member] |  |  |  |
Derivative income reflected in income statement | $ 1,588 | $ 2,680 | $ 3,111 | $ 3,145

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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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