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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