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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivative Assets    
Gross Amounts of Recognized Assets $ 12,797 $ 28,154
Gross Amounts Offset in the Balance Sheet 6,375 3,829
Net Amounts of Assets Presented in the Balance Sheet 6,422 24,325
Collateral 0 3,601
Net Amount 6,422 20,724
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 11,623 8,160
Gross Amounts Offset in the Balance Sheet 3,728 772
Net Amounts of Liabilities Presented in the Balance Sheet 7,895 7,388
Collateral Pledged 651 1,473
Net Amount 7,244 5,915
Not Designated as Hedging Instrument | Other assets    
Derivative Assets    
Gross Amounts of Recognized Assets 8,053 28,090
Gross Amounts Offset in the Balance Sheet 3,165 3,162
Net Amounts of Assets Presented in the Balance Sheet 4,888 24,928
Collateral 0 3,601
Net Amount 4,888 21,327
Not Designated as Hedging Instrument | Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 3,642 234
Gross Amounts Offset in the Balance Sheet 2,057 122
Net Amounts of Assets Presented in the Balance Sheet 1,585 112
Collateral 0 0
Net Amount 1,585 112
Not Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 54  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 54  
Collateral Pledged 54  
Net Amount 0  
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 3,235 22,702
Gross Amounts Offset in the Balance Sheet 695 2,418
Net Amounts of Assets Presented in the Balance Sheet 2,540 20,284
Collateral 0 0
Net Amount 2,540 20,284
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 1,100 1,082
Gross Amounts Offset in the Balance Sheet 413 622
Net Amounts of Assets Presented in the Balance Sheet 687 460
Collateral 0 0
Net Amount 687 460
Not Designated as Hedging Instrument | Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 76 37
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 76 37
Collateral 0 0
Net Amount 76 37
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 244  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 244  
Collateral Pledged 244  
Net Amount 0  
Not Designated as Hedging Instrument | Other assets | Total return swaps    
Derivative Assets    
Gross Amounts of Recognized Assets   3,744
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Assets Presented in the Balance Sheet   3,744
Collateral   3,601
Net Amount   143
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 85  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 85  
Collateral Pledged 0  
Net Amount 85  
Not Designated as Hedging Instrument | Other assets | Equity futures    
Derivative Assets    
Gross Amounts of Recognized Assets   291
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Assets Presented in the Balance Sheet   291
Collateral   0
Net Amount   291
Not Designated as Hedging Instrument | Other liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 11,042 6,342
Gross Amounts Offset in the Balance Sheet 3,468 772
Net Amounts of Liabilities Presented in the Balance Sheet 7,574 5,570
Collateral Pledged 651 1,473
Net Amount 6,923 4,097
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 2,410 1,545
Gross Amounts Offset in the Balance Sheet 2,057 122
Net Amounts of Liabilities Presented in the Balance Sheet 353 1,423
Collateral Pledged 353 1,423
Net Amount 0 0
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities   50
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Liabilities Presented in the Balance Sheet   50
Collateral Pledged   50
Net Amount   0
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 6,885 3,808
Gross Amounts Offset in the Balance Sheet 998 28
Net Amounts of Liabilities Presented in the Balance Sheet 5,887 3,780
Collateral Pledged 0 0
Net Amount 5,887 3,780
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,364 939
Gross Amounts Offset in the Balance Sheet 413 622
Net Amounts of Liabilities Presented in the Balance Sheet 951 317
Collateral Pledged 0 0
Net Amount 951 317
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 4,744 64
Gross Amounts Offset in the Balance Sheet 3,210 667
Net Amounts of Assets Presented in the Balance Sheet 1,534 (603)
Collateral 0 0
Net Amount 1,534 (603)
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 581 1,818
Gross Amounts Offset in the Balance Sheet 260 0
Net Amounts of Liabilities Presented in the Balance Sheet 321 1,818
Collateral Pledged 0 0
Net Amount $ 321 $ 1,818