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Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Gross Amounts Recognized, Derivative Assets | $ 46,013 | $ 61,529
Gross Amounts Offset in the Statement of Financial Condition, Derivative Assets | (41,102) | (58,660)
Net Amounts Presented in the Statement of Financial Condition, Derivative Assets | 4,911 | 2,869
Gross Amounts Not Offset in the Statement of Financial Condition - Financial Instruments, Derivative Assets | 4,911 | 2,869
Gross Amounts Not offset in the Statement of Financial Condition - Cash Collateral, Derivative Assets | 0 | 0
Net Amounts Presented in the Statement of Financial Condition, Derivative Assets | 0 | 0
Gross Amounts Recognized, Derivative Liabilities | 101,940 | 171,275
Gross Amounts Offset in the Statement of Financial Condition, Derivative Liabilities | (72,835) | (126,434)
Net Amounts Presented in the Statement of Financial Condition, Derivative Liabilities | 29,105 | 44,841
Gross Amounts Not Offset in the Statement of Financial Condition - Financial Instruments, Derivative Liabilities | 4,911 | 2,869
Gross Amounts Not offset in the Statement of Financial Condition - Cash Collateral, Derivative Liabilities | 69,668 | 90,312
Gross Amounts Not Offset in the Statement of Financial Condition - Net Amount, Derivatives Liabilities | $ (45,474) | $ (48,340)

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