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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities Available-for-Sale, Amortized Cost |  |
Securities Available-for-Sale, Due in one year or less, Cost | $ 3,238 |
Securities Available-for-Sale, Due after one year through five years, Cost | 18,566 |
Securities Available-for-Sale, Due after five years through ten years, Cost | 156,128 |
Securities Available-for-Sale, Due after ten years, Cost | 571,761 |
Securities Available-for-Sale, Cost, Total | 749,693 |
Securities Available-for-Sale, Estimated Fair Value |  |
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value | 3,241 |
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value | 18,776 |
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value | 156,585 |
Securities Available-for-Sale, Due after ten years, Estimated Fair Value | 571,268 |
Securities Available-for-Sale, Estimated Fair Value, Total | 749,870 |
Securities Held-to-Maturity, Amortized Cost |  |
Securities Held-to-Maturity, Due in one year or less, Cost | 0 |
Securities Held-to-Maturity, Due after one year through five years, Cost | 0 |
Securities Held-to-Maturity, Due after five years through ten years, Cost | 4,929 |
Securities Held-to-Maturity, Due after ten years, Cost | 50,397 |
Securities Held-to-Maturity, Amortized Cost | 55,326 | $ 60,827
Securities Held-to-Maturity, Estimated Fair Value |  |
Securities Held-to-Maturity, Due in one year or less, Estimated Fair Value | 0 |
Securities Held-to-Maturity, Due after one year through five years, Estimated Fair Value | 0 |
Securities Held-to-Maturity, Due after five years through ten years, Estimated Fair Value | 5,230 |
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value | 50,855 |
Securities Held-to-Maturity, Estimated Fair Value | $ 56,085 | $ 60,706

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