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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Investments [Abstract] |
Securities Available-for-Sale, Due in one year or less, Cost | $ 5,211
Securities Available-for-Sale, Due after one year through five years, Cost | 32,776
Securities Available-for-Sale, Due after five years through ten years, Cost | 276,898
Securities Available-for-Sale, Due after ten years, Cost | 813,278
Securities Available-for-Sale, Cost, Total | 1,128,163
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value | 5,307
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value | 34,499
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value | 293,388
Securities Available-for-Sale, Due after ten years, Estimated Fair Value | 843,603
Securities Available-for-Sale, Estimated Fair Value, Total | $ 1,176,797

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