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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 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other Assets |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | $ 4,208 | $ 6,968
Gross Amounts Offset in the Balance Sheet | 1,705 | 1,662
Net Amounts of Assets Presented in the Balance Sheet | 2,503 | 5,306
Collateral | 0 | 0
Net Amount | 2,503 | 5,306
Other Assets | Interest Rate Futures |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 1,384 | 1,059
Gross Amounts Offset in the Balance Sheet | 1,235 | 937
Net Amounts of Assets Presented in the Balance Sheet | 149 | 122
Collateral | 0 | 0
Net Amount | 149 | 122
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 774 | 4,645
Gross Amounts Offset in the Balance Sheet | 0 | 82
Net Amounts of Assets Presented in the Balance Sheet | 774 | 4,563
Collateral | 0 | 0
Net Amount | 774 | 4,563
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 621 | 1,007
Gross Amounts Offset in the Balance Sheet | 447 | 599
Net Amounts of Assets Presented in the Balance Sheet | 174 | 408
Collateral | 0 | 0
Net Amount | 174 | 408
Other Assets | Credit Default Swaps |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 1,429 | 257
Gross Amounts Offset in the Balance Sheet | 23 | 44
Net Amounts of Assets Presented in the Balance Sheet | 1,406 | 213
Collateral | 0 | 0
Net Amount | 1,406 | 213
Other Liabilities |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 13,527 | 5,481
Gross Amounts Offset in the Balance Sheet | 2,102 | 1,661
Net Amounts of Liabilities Presented in the Balance Sheet | 11,425 | 3,820
Collateral Pledged | 789 | 1,803
Net Amount | 10,636 | 2,017
Other Liabilities | Interest Rate Futures |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 2,030 | 2,293
Gross Amounts Offset in the Balance Sheet | 1,235 | 937
Net Amounts of Liabilities Presented in the Balance Sheet | 795 | 1,356
Collateral Pledged | 789 | 1,356
Net Amount | 6 | 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 10,550 | 1,891
Gross Amounts Offset in the Balance Sheet | 397 | 81
Net Amounts of Liabilities Presented in the Balance Sheet | 10,153 | 1,810
Collateral Pledged | 0 | 0
Net Amount | 10,153 | 1,810
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 766 | 806
Gross Amounts Offset in the Balance Sheet | 447 | 599
Net Amounts of Liabilities Presented in the Balance Sheet | 319 | 207
Collateral Pledged | 0 | 0
Net Amount | 319 | 207
Other Liabilities | Credit Default Swaps |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 181 | 491
Gross Amounts Offset in the Balance Sheet | 23 | 44
Net Amounts of Liabilities Presented in the Balance Sheet | 158 | 447
Collateral Pledged | 0 | 447
Net Amount | $ 158 | $ 0

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