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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 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Other Assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 8,809 | $ 6,968
Gross Amounts Offset in the Balance Sheet | 2,427 | 1,662
Net Amounts of Assets Presented in the Balance Sheet | 6,382 | 5,306
Collateral | 420 | 0
Net Amount | 5,962 | 5,306
Other Assets | Interest Rate Futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,781 | 1,059
Gross Amounts Offset in the Balance Sheet | 1,645 | 937
Net Amounts of Assets Presented in the Balance Sheet | 1,136 | 122
Collateral | 0 | 0
Net Amount | 1,136 | 122
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 4,677 | 4,645
Gross Amounts Offset in the Balance Sheet | 508 | 82
Net Amounts of Assets Presented in the Balance Sheet | 4,169 | 4,563
Collateral | 0 | 0
Net Amount | 4,169 | 4,563
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 244 | 1,007
Gross Amounts Offset in the Balance Sheet | 168 | 599
Net Amounts of Assets Presented in the Balance Sheet | 76 | 408
Collateral | 0 | 0
Net Amount | 76 | 408
Other Assets | Credit Default Swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,107 | 257
Gross Amounts Offset in the Balance Sheet | 106 | 44
Net Amounts of Assets Presented in the Balance Sheet | 1,001 | 213
Collateral | 420 | 0
Net Amount | 581 | 213
Other Liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 3,619 | 5,481
Gross Amounts Offset in the Balance Sheet | 1,919 | 1,661
Net Amounts of Liabilities Presented in the Balance Sheet | 1,700 | 3,820
Collateral Pledged | 419 | 1,803
Net Amount | 1,281 | 2,017
Other Liabilities | Interest Rate Futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,865 | 2,293
Gross Amounts Offset in the Balance Sheet | 1,645 | 937
Net Amounts of Liabilities Presented in the Balance Sheet | 220 | 1,356
Collateral Pledged | 220 | 1,356
Net Amount | 0 | 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,129 | 1,891
Gross Amounts Offset in the Balance Sheet | 0 | 81
Net Amounts of Liabilities Presented in the Balance Sheet | 1,129 | 1,810
Collateral Pledged | 0 | 0
Net Amount | 1,129 | 1,810
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 200 | 806
Gross Amounts Offset in the Balance Sheet | 168 | 599
Net Amounts of Liabilities Presented in the Balance Sheet | 32 | 207
Collateral Pledged | 0 | 0
Net Amount | 32 | 207
Other Liabilities | Credit Default Swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 425 | 491
Gross Amounts Offset in the Balance Sheet | 106 | 44
Net Amounts of Liabilities Presented in the Balance Sheet | 319 | 447
Collateral Pledged | 199 | 447
Net Amount | $ 120 | $ 0

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