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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Investments [Abstract] |  |
Securities Available-for-Sale, Due in one year or less, Cost | $ 1,610 |
Securities Available-for-Sale, Due after one year through five years, Cost | 16,578 |
Securities Available-for-Sale, Due after five years through ten years, Cost | 213,829 |
Securities Available-for-Sale, Due after ten years, Cost | 559,859 |
Securities Available-for-Sale, Cost, Total | 791,876 |
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value | 1,620 |
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value | 17,017 |
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value | 217,872 |
Securities Available-for-Sale, Due after ten years, Estimated Fair Value | 571,356 |
Securities Available-for-Sale, Estimated Fair Value, Total | 807,865 |
Securities Held-to-Maturity, Due within One Year, Cost | 0 |
Securities Held-to-Maturity, Due after One Through Five Years, Cost | 0 |
Securities Held-to-Maturity, Due after five years through ten years, Cost | 4,937 |
Securities Held-to-Maturity, Due after ten years, Cost | 44,099 |
Securities Held-to-Maturity, Cost, Total | 49,036 | $ 60,827
Securities Held-to-Maturity, Due within One Year, Fair Value | 0 |
Securities Held-to-Maturity, Due after One Through Five Years, Fair Value | 0 |
Securities Held-to-Maturity, Due after five years through ten years, Estimated Fair Value | 5,241 |
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value | 45,357 |
Securities held-to-maturity, Estimated Fair Value | $ 50,598 | $ 60,706

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