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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Derivative Assets    
Gross Amounts of Recognized Assets $ 17,066 $ 28,154
Gross Amounts Offset in the Balance Sheet 6,463 3,829
Net Amounts of Assets Presented in the Balance Sheet 10,603 24,325
Collateral 0 3,601
Net Amount 10,603 20,724
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 6,639 8,160
Gross Amounts Offset in the Balance Sheet 111 772
Net Amounts of Liabilities Presented in the Balance Sheet 6,528 7,388
Collateral Pledged 2,550 1,473
Net Amount 3,978 5,915
Not Designated as Hedging Instrument | Other assets    
Derivative Assets    
Gross Amounts of Recognized Assets 17,066 28,090
Gross Amounts Offset in the Balance Sheet 2,510 3,162
Net Amounts of Assets Presented in the Balance Sheet 14,556 24,928
Collateral 0 3,601
Net Amount 14,556 21,327
Not Designated as Hedging Instrument | Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 492 234
Gross Amounts Offset in the Balance Sheet (932) 122
Net Amounts of Assets Presented in the Balance Sheet 1,424 112
Collateral 0 0
Net Amount 1,424 112
Not Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 37  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 37  
Collateral Pledged 37  
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 16,104 22,702
Gross Amounts Offset in the Balance Sheet 3,366 2,418
Net Amounts of Assets Presented in the Balance Sheet 12,738 20,284
Collateral 0 0
Net Amount 12,738 20,284
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 209 1,082
Gross Amounts Offset in the Balance Sheet 76 622
Net Amounts of Assets Presented in the Balance Sheet 133 460
Collateral 0 0
Net Amount 133 460
Not Designated as Hedging Instrument | Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 261 37
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 261 37
Collateral 0 0
Net Amount 261 37
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 0  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 0  
Collateral Pledged 0  
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 779  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 779  
Collateral Pledged 779  
Net Amount 0  
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   6,342
Gross Amounts Offset in the Balance Sheet   772
Net Amounts of Liabilities Presented in the Balance Sheet   5,570
Collateral Pledged   1,473
Net Amount   4,097
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 196 1,545
Gross Amounts Offset in the Balance Sheet (932) 122
Net Amounts of Liabilities Presented in the Balance Sheet 1,128 1,423
Collateral Pledged 1,128 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 2,102 3,808
Gross Amounts Offset in the Balance Sheet 967 28
Net Amounts of Liabilities Presented in the Balance Sheet 1,135 3,780
Collateral Pledged 0 0
Net Amount 1,135 3,780
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 2,919 939
Gross Amounts Offset in the Balance Sheet 76 622
Net Amounts of Liabilities Presented in the Balance Sheet 2,843 317
Collateral Pledged 0 0
Net Amount 2,843 317
Not Designated as Hedging Instrument | Other liabilities | Equity futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 606  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 606  
Collateral Pledged 606  
Net Amount 0  
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 0 64
Gross Amounts Offset in the Balance Sheet 3,953 667
Net Amounts of Assets Presented in the Balance Sheet (3,953) (603)
Collateral 0 0
Net Amount $ (3,953) (603)
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities   1,818
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Liabilities Presented in the Balance Sheet   1,818
Collateral Pledged   0
Net Amount   $ 1,818