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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Other Assets    
Derivative Assets    
Gross Amounts of Recognized Assets $ 11,081 $ 4,208
Gross Amounts Offset in the Balance Sheet 1,627 1,705
Net Amounts of Assets Presented in the Balance Sheet 9,454 2,503
Collateral 0 0
Net Amount 9,454 2,503
Other Assets | Interest Rate Futures    
Derivative Assets    
Gross Amounts of Recognized Assets 1,277 1,384
Gross Amounts Offset in the Balance Sheet 973 1,235
Net Amounts of Assets Presented in the Balance Sheet 304 149
Collateral 0 0
Net Amount 304 149
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations    
Derivative Assets    
Gross Amounts of Recognized Assets 7,245 774
Gross Amounts Offset in the Balance Sheet 617 0
Net Amounts of Assets Presented in the Balance Sheet 6,628 774
Collateral 0 0
Net Amount 6,628 774
Other Assets | Foreign Currency Forward Contracts, Investment Operations    
Derivative Assets    
Gross Amounts of Recognized Assets 57 621
Gross Amounts Offset in the Balance Sheet 18 447
Net Amounts of Assets Presented in the Balance Sheet 39 174
Collateral 0 0
Net Amount 39 174
Other Assets | Credit Default Swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 2,502 1,429
Gross Amounts Offset in the Balance Sheet 19 23
Net Amounts of Assets Presented in the Balance Sheet 2,483 1,406
Collateral 0 0
Net Amount 2,483 1,406
Other Liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 4,073 13,527
Gross Amounts Offset in the Balance Sheet 1,010 2,102
Net Amounts of Liabilities Presented in the Balance Sheet 3,063 11,425
Collateral Pledged 94 789
Net Amount 2,969 10,636
Other Liabilities | Interest Rate Futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,067 2,030
Gross Amounts Offset in the Balance Sheet 973 1,235
Net Amounts of Liabilities Presented in the Balance Sheet 94 795
Collateral Pledged 94 789
Net Amount 0 6
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 2,273 10,550
Gross Amounts Offset in the Balance Sheet 0 397
Net Amounts of Liabilities Presented in the Balance Sheet 2,273 10,153
Collateral Pledged 0 0
Net Amount 2,273 10,153
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 97 766
Gross Amounts Offset in the Balance Sheet 18 447
Net Amounts of Liabilities Presented in the Balance Sheet 79 319
Collateral Pledged 0 0
Net Amount 79 319
Other Liabilities | Credit Default Swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 636 181
Gross Amounts Offset in the Balance Sheet 19 23
Net Amounts of Liabilities Presented in the Balance Sheet 617 158
Collateral Pledged 0 0
Net Amount $ 617 $ 158