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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | $ 60,827 | $ 64,449
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 173 | 1,222
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 294 | 25
Securities held-to-maturity, Estimated Fair Value | 60,706 | 65,646
Marketable Securities | 812,891 | 628,985
Other Investments | 28,810 | 14,147
Equity Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Marketable Securities | 10,313 |
US Government Agencies Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 56,827 | 60,449
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 173 | 1,222
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 294 | 25
Securities held-to-maturity, Estimated Fair Value | 56,706 | 61,646
Trust preferred securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, Amortized Cost | 4,000 | 4,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Securities held-to-maturity, Estimated Fair Value | 4,000 | 4,000
Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 18,497 | $ 14,147

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