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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Derivative Assets    
Gross Amounts of Recognized Assets $ 16,530 $ 17,889
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 16,530 17,889
Collateral Received 0 0
Net Amount 16,530 17,889
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 40,423 16,954
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 40,423 16,954
Collateral Pledged 4,844 1,599
Net Amount 35,579 15,355
Not Designated as Hedging Instrument    
Derivative Assets    
Gross Amounts of Recognized Assets 16,530 16,523
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 16,530 16,523
Collateral Received 0 0
Net Amount 16,530 16,523
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 36,670 12,891
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 36,670 12,891
Collateral Pledged 4,844 1,599
Net Amount 31,826 11,292
Not Designated as Hedging Instrument | Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 1,614 1,068
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 1,614 1,068
Collateral Received 0 0
Net Amount 1,614 1,068
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 12,590 13,730
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 12,590 13,730
Collateral Received 0 0
Net Amount 12,590 13,730
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 2,156 1,247
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 2,156 1,247
Collateral Received 0 0
Net Amount 2,156 1,247
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 7,569  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 7,569  
Collateral Pledged 0  
Net Amount 7,569  
Not Designated as Hedging Instrument | Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 170 478
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 170 478
Collateral Received 0 0
Net Amount 170 478
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 658 1,426
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 658 1,426
Collateral Pledged 658 1,426
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 24,257 7,880
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 24,257 7,880
Collateral Pledged 0 0
Net Amount 24,257 7,880
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities   3,412
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Liabilities Presented in the Balance Sheet   3,412
Collateral Pledged   0
Net Amount   3,412
Not Designated as Hedging Instrument | Other liabilities | Equity futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 4,186 173
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 4,186 173
Collateral Pledged 4,186 173
Net Amount 0 0
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets   1,366
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Assets Presented in the Balance Sheet   1,366
Collateral Received   0
Net Amount   1,366
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 3,753 4,063
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 3,753 4,063
Collateral Pledged 0 0
Net Amount $ 3,753 $ 4,063