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Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Gross Amounts Recognized, Derivative Assets | $ 32,718 | $ 16,167
Gross Amounts Offset in the Statement of Income, Derivative Assets | (32,694) | (12,842)
Net Amounts Presented in the Statement of Income, Derivative Assets | 24 | 3,325
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Assets | 24 | 1,846
Net Amounts Presented in the Statement of Income, Derivative Assets |  | 1,479
Gross Amounts Recognized, Derivative Liabilities | 79,900 | 23,811
Gross Amounts Offset in the Statement of Income, Derivative Liabilities | (65,280) | (21,651)
Net Amounts Presented in the Statement of Income, Derivative Liabilities | 14,620 | 2,160
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Liabilities | 24 | 1,846
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Liabilities | 37,657 | 2,871
Net Amounts Presented in the Statement of Income, Derivative Liabilities | $ (23,061) | $ (2,557)

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