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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 20,592 | $ 46,349
Gross Amounts Offset in the Balance Sheet | 143 | 1,116
Net Amounts of Assets Presented in the Balance Sheet | 20,449 | 45,233
Collateral | 0 | 0
Net Amount | 20,449 | 45,233
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 26,607 | 23,292
Gross Amounts Offset in the Balance Sheet | 143 | 932
Net Amounts of Liabilities Presented in the Balance Sheet | 26,464 | 22,360
Collateral Pledged | 2,494 | 1,620
Net Amount | 23,970 | 20,740
Not Designated as Hedging Instrument | Other assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 18,574 | 26,396
Gross Amounts Offset in the Balance Sheet | 143 | 1,116
Net Amounts of Assets Presented in the Balance Sheet | 18,431 | 25,280
Collateral | 0 | 0
Net Amount | 18,431 | 25,280
Not Designated as Hedging Instrument | Other assets | Interest rate futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,317 | 1,019
Gross Amounts Offset in the Balance Sheet | 0 | 863
Net Amounts of Assets Presented in the Balance Sheet | 2,317 | 156
Collateral | 0 | 0
Net Amount | 2,317 | 156
Not Designated as Hedging Instrument | Other assets | Interest rate swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 232 | 22
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 232 | 22
Collateral | 0 | 0
Net Amount | 232 | 22
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 13,064 | 23,055
Gross Amounts Offset in the Balance Sheet | 0 | 184
Net Amounts of Assets Presented in the Balance Sheet | 13,064 | 22,871
Collateral | 0 | 0
Net Amount | 13,064 | 22,871
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,750 | 2,232
Gross Amounts Offset in the Balance Sheet | 143 | 69
Net Amounts of Assets Presented in the Balance Sheet | 2,607 | 2,163
Collateral | 0 | 0
Net Amount | 2,607 | 2,163
Not Designated as Hedging Instrument | Other assets | Credit default swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 211 | 68
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 211 | 68
Collateral | 0 | 0
Net Amount | 211 | 68
Not Designated as Hedging Instrument | Other liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 24,242 | 18,140
Gross Amounts Offset in the Balance Sheet | 143 | 932
Net Amounts of Liabilities Presented in the Balance Sheet | 24,099 | 17,208
Collateral Pledged | 2,494 | 1,620
Net Amount | 21,605 | 15,588
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 2,494 | 1,430
Gross Amounts Offset in the Balance Sheet | 0 | 863
Net Amounts of Liabilities Presented in the Balance Sheet | 2,494 | 567
Collateral Pledged | 2,494 | 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 | 17,573 | 12,791
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 17,573 | 12,791
Collateral Pledged | 0 | 0
Net Amount | 17,573 | 12,791
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 4,175 | 3,919
Gross Amounts Offset in the Balance Sheet | 143 | 69
Net Amounts of Liabilities Presented in the Balance Sheet | 4,032 | 3,850
Collateral Pledged | 0 | 1,053
Net Amount | 4,032 | 2,797
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,018 | 19,953
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 2,018 | 19,953
Collateral | 0 | 0
Net Amount | 2,018 | 19,953
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 2,365 | 5,152
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 2,365 | 5,152
Collateral Pledged | 0 | 0
Net Amount | $ 2,365 | $ 5,152

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