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Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivatives [Abstract] |  |
Gross Amounts Recognized, Derivative Assets | $ 16,167 | $ 7,155
Gross Amounts Offset in the Statement of Income, Derivative Assets | (12,842) | (5,007)
Net Amounts Presented in the Statement of Income, Derivative Assets | 3,325 | 2,148
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Assets | 1,846 | 2,148
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Assets |  |
Net Amounts Presented in the Statement of Income, Derivative Assets | 1,479 |
Gross Amounts Recognized, Derivative Liabilities | 23,811 | 24,015
Gross Amounts Offset in the Statement of Income, Derivative Liabilities | (21,651) | (20,077)
Net Amounts Presented in the Statement of Income, Derivative Liabilities | 2,160 | 3,938
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Liabilities | 1,846 | 2,148
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Liabilities | 2,871 | 4,099
Net Amounts Presented in the Statement of Income, Derivative Liabilities | $ (2,557) | $ (2,309)

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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