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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivative Assets    
Gross Amounts of Recognized Assets $ 10,036 $ 46,349
Gross Amounts Offset in the Balance Sheet 571 1,116
Net Amounts of Assets Presented in the Balance Sheet 9,465 45,233
Collateral 0 0
Net Amount 9,465 45,233
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 17,127 23,292
Gross Amounts Offset in the Balance Sheet 1,497 932
Net Amounts of Liabilities Presented in the Balance Sheet 15,630 22,360
Collateral Pledged 1,281 1,620
Net Amount 14,349 20,740
Not Designated as Hedging Instrument | Other assets    
Derivative Assets    
Gross Amounts of Recognized Assets 6,724 26,396
Gross Amounts Offset in the Balance Sheet 0 1,116
Net Amounts of Assets Presented in the Balance Sheet 6,724 25,280
Collateral 0 0
Net Amount 6,724 25,280
Not Designated as Hedging Instrument | Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 837 1,019
Gross Amounts Offset in the Balance Sheet 0 863
Net Amounts of Assets Presented in the Balance Sheet 837 156
Collateral 0 0
Net Amount 837 156
Not Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 21 22
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 21 22
Collateral 0 0
Net Amount 21 22
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 4,089 23,055
Gross Amounts Offset in the Balance Sheet 0 184
Net Amounts of Assets Presented in the Balance Sheet 4,089 22,871
Collateral 0 0
Net Amount 4,089 22,871
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 1,355 2,232
Gross Amounts Offset in the Balance Sheet 0 69
Net Amounts of Assets Presented in the Balance Sheet 1,355 2,163
Collateral 0 0
Net Amount 1,355 2,163
Not Designated as Hedging Instrument | Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 95 68
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 95 68
Collateral 0 0
Net Amount 95 68
Not Designated as Hedging Instrument | Other assets | Total return swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 327  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 327  
Collateral 0  
Net Amount 327  
Not Designated as Hedging Instrument | Other liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 16,762 18,140
Gross Amounts Offset in the Balance Sheet 1,497 932
Net Amounts of Liabilities Presented in the Balance Sheet 15,265 17,208
Collateral Pledged 1,281 1,620
Net Amount 13,984 15,588
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,281 1,430
Gross Amounts Offset in the Balance Sheet 0 863
Net Amounts of Liabilities Presented in the Balance Sheet 1,281 567
Collateral Pledged 1,281 567
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 10,185 12,791
Gross Amounts Offset in the Balance Sheet 1,497 0
Net Amounts of Liabilities Presented in the Balance Sheet 8,688 12,791
Collateral Pledged 0 0
Net Amount 8,688 12,791
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 5,296 3,919
Gross Amounts Offset in the Balance Sheet 0 69
Net Amounts of Liabilities Presented in the Balance Sheet 5,296 3,850
Collateral Pledged 0 1,053
Net Amount 5,296 2,797
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 3,312 19,953
Gross Amounts Offset in the Balance Sheet 571 0
Net Amounts of Assets Presented in the Balance Sheet 2,741 19,953
Collateral 0 0
Net Amount 2,741 19,953
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 365 5,152
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 365 5,152
Collateral Pledged 0 0
Net Amount $ 365 $ 5,152