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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, 2016 | Dec. 31, 2015
--- | --- | ---
Other Assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 7,603 | $ 6,968
Gross Amounts Offset in the Balance Sheet | 521 | 1,662
Net Amounts of Assets Presented in the Balance Sheet | 7,082 | 5,306
Collateral | 447 | 0
Net Amount | 6,635 | 5,306
Other Assets | Interest Rate Contracts |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,514 | 1,059
Gross Amounts Offset in the Balance Sheet | 262 | 937
Net Amounts of Assets Presented in the Balance Sheet | 1,252 | 122
Collateral | 0 | 0
Net Amount | 1,252 | 122
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 5,236 | 4,645
Gross Amounts Offset in the Balance Sheet | 73 | 82
Net Amounts of Assets Presented in the Balance Sheet | 5,163 | 4,563
Collateral | 0 | 0
Net Amount | 5,163 | 4,563
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 127 | 1,007
Gross Amounts Offset in the Balance Sheet | 87 | 599
Net Amounts of Assets Presented in the Balance Sheet | 40 | 408
Collateral | 0 | 0
Net Amount | 40 | 408
Other Assets | Credit Default Swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 726 | 257
Gross Amounts Offset in the Balance Sheet | 99 | 44
Net Amounts of Assets Presented in the Balance Sheet | 627 | 213
Collateral | 447 | 0
Net Amount | 180 | 213
Other Liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 6,827 | 5,481
Gross Amounts Offset in the Balance Sheet | 2,113 | 1,661
Net Amounts of Liabilities Presented in the Balance Sheet | 4,714 | 3,820
Collateral Pledged | 396 | 1,803
Net Amount | 4,318 | 2,017
Other Liabilities | Interest Rate Contracts |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 430 | 2,293
Gross Amounts Offset in the Balance Sheet | 262 | 937
Net Amounts of Liabilities Presented in the Balance Sheet | 168 | 1,356
Collateral Pledged | 151 | 1,356
Net Amount | 17 | 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 4,968 | 1,891
Gross Amounts Offset in the Balance Sheet | 1,665 | 81
Net Amounts of Liabilities Presented in the Balance Sheet | 3,303 | 1,810
Collateral Pledged | 0 | 0
Net Amount | 3,303 | 1,810
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,060 | 806
Gross Amounts Offset in the Balance Sheet | 87 | 599
Net Amounts of Liabilities Presented in the Balance Sheet | 973 | 207
Collateral Pledged | 0 | 0
Net Amount | 973 | 207
Other Liabilities | Credit Default Swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 369 | 491
Gross Amounts Offset in the Balance Sheet | 99 | 44
Net Amounts of Liabilities Presented in the Balance Sheet | 270 | 447
Collateral Pledged | 245 | 447
Net Amount | $ 25 | $ 0

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