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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Securities Available-for-Sale, Amortized Cost |  |
Securities Available-for-Sale, Due in one year or less, Cost | $ 2,861 |
Securities Available-for-Sale, Due after one year through five years, Cost | 10,933 |
Securities Available-for-Sale, Due after five years through ten years, Cost | 76,575 |
Securities Available-for-Sale, Due after ten years, Cost | 478,759 |
Securities Available-for-Sale, Cost, Total | 569,128 |
Securities Available-for-Sale, Estimated Fair Value |  |
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value | 2,863 |
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value | 10,954 |
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value | 73,198 |
Securities Available-for-Sale, Due after ten years, Estimated Fair Value | 464,133 |
Securities Available-for-Sale, Estimated Fair Value, Total | 551,148 |
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 | 0 |
Securities Held-to-Maturity, Due after ten years, Cost | 60,030 |
Securities Held-to-Maturity, Amortized Cost | 60,030 | $ 64,449
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 | 0 |
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value | 59,628 |
Securities Held-to-Maturity, Estimated Fair Value | $ 59,628 | $ 65,646

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