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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other assets    
Derivative Assets    
Gross Amounts of Recognized Assets $ 11,942 $ 22,874
Gross Amounts Offset in the Balance Sheet 663 3,944
Net Amounts of Assets Presented in the Balance Sheet 11,279 18,930
Collateral 0 0
Net Amount 11,279 18,930
Other liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 11,009 8,225
Gross Amounts Offset in the Balance Sheet 284 1,684
Net Amounts of Liabilities Presented in the Balance Sheet 10,725 6,540
Collateral Pledged 231 2,132
Net Amount 10,494 4,408
Not Designated as Hedging Instrument | Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 87 971
Gross Amounts Offset in the Balance Sheet 85 636
Net Amounts of Assets Presented in the Balance Sheet 2 335
Collateral 0 0
Net Amount 2 335
Not Designated as Hedging Instrument | Other assets | Interest rate swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 8 860
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 8 860
Collateral 0 0
Net Amount 8 860
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 4,980 16,459
Gross Amounts Offset in the Balance Sheet 379 2,260
Net Amounts of Assets Presented in the Balance Sheet 4,601 14,199
Collateral 0 0
Net Amount 4,601 14,199
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 199 3,194
Gross Amounts Offset in the Balance Sheet 199 71
Net Amounts of Assets Presented in the Balance Sheet 0 3,123
Collateral 0 0
Net Amount 0 3,123
Not Designated as Hedging Instrument | Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 115  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 115  
Collateral 0  
Net Amount 115  
Not Designated as Hedging Instrument | Other assets | Total return swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 6,550  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 6,550  
Collateral 0  
Net Amount 6,550  
Not Designated as Hedging Instrument | Other assets | Equity futures    
Derivative Assets    
Gross Amounts of Recognized Assets 3 1,390
Gross Amounts Offset in the Balance Sheet 0 977
Net Amounts of Assets Presented in the Balance Sheet 3 413
Collateral 0 0
Net Amount 3 413
Not Designated as Hedging Instrument | Other liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 9,630  
Gross Amounts Offset in the Balance Sheet 284  
Net Amounts of Liabilities Presented in the Balance Sheet 9,346  
Collateral Pledged 231  
Net Amount 9,115  
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 294 910
Gross Amounts Offset in the Balance Sheet 85 636
Net Amounts of Liabilities Presented in the Balance Sheet 209 273
Collateral Pledged 205 273
Net Amount 4 0
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 26 506
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 26 506
Collateral Pledged 26 254
Net Amount 0 252
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 8,857 4,154
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 8,857 4,154
Collateral Pledged 0 0
Net Amount 8,857 4,154
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 453 72
Gross Amounts Offset in the Balance Sheet 199 71
Net Amounts of Liabilities Presented in the Balance Sheet 254 1
Collateral Pledged 0 0
Net Amount 254 1
Not Designated as Hedging Instrument | Other liabilities | Credit default swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities   1,606
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Liabilities Presented in the Balance Sheet   1,606
Collateral Pledged   1,605
Net Amount   1
Not Designated as Hedging Instrument | Other liabilities | Equity futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities   977
Gross Amounts Offset in the Balance Sheet   977
Net Amounts of Liabilities Presented in the Balance Sheet   0
Collateral Pledged   0
Net Amount   $ 0
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,379  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 1,379  
Collateral Pledged 0  
Net Amount $ 1,379