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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investments [Abstract] |  |
Securities Available-for-Sale, Due in one year or less, Cost | $ 5,592 |
Securities Available-for-Sale, Due after one year through five years, Cost | 24,793 |
Securities Available-for-Sale, Due after five years through ten years, Cost | 132,761 |
Securities Available-for-Sale, Due after ten years, Cost | 565,972 |
Securities Available-for-Sale, Cost, Total | 729,118 |
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value | 5,572 |
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value | 24,879 |
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value | 130,569 |
Securities Available-for-Sale, Due after ten years, Estimated Fair Value | 557,041 |
Securities Available-for-Sale, Estimated Fair Value, Total | 718,061 |
Securities Held-to-Maturity, Due after five years through ten years, Cost | 4,927 |
Securities Held-to-Maturity, Due after ten years, Cost | 55,900 |
Securities Held-to-Maturity, Cost, Total | 60,827 | $ 64,449
Securities Held-to-Maturity, Due after five years through ten years, Estimated Fair Value | 5,053 |
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value | 55,653 |
Securities held-to-maturity, Estimated Fair Value | $ 60,706 | $ 65,646

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