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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 14,717 | $ 46,349
Gross Amounts Offset in the Balance Sheet | 0 | 1,116
Net Amounts of Assets Presented in the Balance Sheet | 14,717 | 45,233
Collateral Received | 0 | 0
Net Amount | 14,717 | 45,233
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 25,204 | 23,292
Gross Amounts Offset in the Balance Sheet | 0 | 932
Net Amounts of Liabilities Presented in the Balance Sheet | 25,204 | 22,360
Collateral Pledged | 761 | 1,620
Net Amount | 24,443 | 20,740
Not Designated as Hedging Instrument | Other assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 12,413 | 26,396
Gross Amounts Offset in the Balance Sheet | 0 | 1,116
Net Amounts of Assets Presented in the Balance Sheet | 12,413 | 25,280
Collateral Received | 0 | 0
Net Amount | 12,413 | 25,280
Not Designated as Hedging Instrument | Other assets | Interest rate futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,156 | 1,019
Gross Amounts Offset in the Balance Sheet | 0 | 863
Net Amounts of Assets Presented in the Balance Sheet | 1,156 | 156
Collateral Received | 0 | 0
Net Amount | 1,156 | 156
Not Designated as Hedging Instrument | Other assets | Interest rate swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 11 | 22
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 11 | 22
Collateral Received | 0 | 0
Net Amount | 11 | 22
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 9,464 | 23,055
Gross Amounts Offset in the Balance Sheet | 0 | 184
Net Amounts of Assets Presented in the Balance Sheet | 9,464 | 22,871
Collateral Received | 0 | 0
Net Amount | 9,464 | 22,871
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,782 | 2,232
Gross Amounts Offset in the Balance Sheet | 0 | 69
Net Amounts of Assets Presented in the Balance Sheet | 1,782 | 2,163
Collateral Received | 0 | 0
Net Amount | 1,782 | 2,163
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 3,402 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 3,402 |
Collateral Pledged | 0 |
Net Amount | 3,402 |
Not Designated as Hedging Instrument | Other assets | Credit default swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets |  | 68
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Assets Presented in the Balance Sheet |  | 68
Collateral Received |  | 0
Net Amount |  | 68
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 57 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 57 |
Collateral Pledged | 57 |
Net Amount | 0 |
Not Designated as Hedging Instrument | Other assets | Total return swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 258 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 258 |
Collateral Pledged | 258 |
Net Amount | 0 |
Not Designated as Hedging Instrument | Other liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 22,529 | 18,140
Gross Amounts Offset in the Balance Sheet | 0 | 932
Net Amounts of Liabilities Presented in the Balance Sheet | 22,529 | 17,208
Collateral Pledged | 761 | 1,620
Net Amount | 21,768 | 15,588
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 446 | 1,430
Gross Amounts Offset in the Balance Sheet | 0 | 863
Net Amounts of Liabilities Presented in the Balance Sheet | 446 | 567
Collateral Pledged | 446 | 567
Net Amount | 0 | 0
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 18,366 | 12,791
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 18,366 | 12,791
Collateral Pledged | 0 | 0
Net Amount | 18,366 | 12,791
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities |  | 3,919
Gross Amounts Offset in the Balance Sheet |  | 69
Net Amounts of Liabilities Presented in the Balance Sheet |  | 3,850
Collateral Pledged |  | 1,053
Net Amount |  | 2,797
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,304 | 19,953
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 2,304 | 19,953
Collateral Received | 0 | 0
Net Amount | 2,304 | 19,953
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 2,675 | 5,152
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 2,675 | 5,152
Collateral Pledged | 0 | 0
Net Amount | $ 2,675 | $ 5,152

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