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Derivative and Hedging Activities Income impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Interest Income [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | $ (13) | $ 0
Other Operating Income (Expense) [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 0 | 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Income [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | (2,409) | 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Operating Income (Expense) [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 0 | 0
Designated as Hedging Instrument | Interest Income [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 2,396 | 0
Designated as Hedging Instrument | Other Operating Income (Expense) [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | $ 0 | $ 0

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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + 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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