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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 16,530 | $ 17,889
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 16,530 | 17,889
Collateral Received | 0 | 0
Net Amount | 16,530 | 17,889
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 40,423 | 16,954
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 40,423 | 16,954
Collateral Pledged | 4,844 | 1,599
Net Amount | 35,579 | 15,355
Not Designated as Hedging Instrument |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 16,530 | 16,523
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 16,530 | 16,523
Collateral Received | 0 | 0
Net Amount | 16,530 | 16,523
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 36,670 | 12,891
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 36,670 | 12,891
Collateral Pledged | 4,844 | 1,599
Net Amount | 31,826 | 11,292
Not Designated as Hedging Instrument | Other assets | Interest rate futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,614 | 1,068
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 1,614 | 1,068
Collateral Received | 0 | 0
Net Amount | 1,614 | 1,068
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 12,590 | 13,730
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 12,590 | 13,730
Collateral Received | 0 | 0
Net Amount | 12,590 | 13,730
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,156 | 1,247
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 2,156 | 1,247
Collateral Received | 0 | 0
Net Amount | 2,156 | 1,247
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 7,569 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 7,569 |
Collateral Pledged | 0 |
Net Amount | 7,569 |
Not Designated as Hedging Instrument | Other assets | Credit default swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 170 | 478
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 170 | 478
Collateral Received | 0 | 0
Net Amount | 170 | 478
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 658 | 1,426
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 658 | 1,426
Collateral Pledged | 658 | 1,426
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 | 24,257 | 7,880
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 24,257 | 7,880
Collateral Pledged | 0 | 0
Net Amount | 24,257 | 7,880
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities |  | 3,412
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Liabilities Presented in the Balance Sheet |  | 3,412
Collateral Pledged |  | 0
Net Amount |  | 3,412
Not Designated as Hedging Instrument | Other liabilities | Equity futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 4,186 | 173
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 4,186 | 173
Collateral Pledged | 4,186 | 173
Net Amount | 0 | 0
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets |  | 1,366
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Assets Presented in the Balance Sheet |  | 1,366
Collateral Received |  | 0
Net Amount |  | 1,366
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 3,753 | 4,063
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 3,753 | 4,063
Collateral Pledged | 0 | 0
Net Amount | $ 3,753 | $ 4,063

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