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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Securities Available-for-Sale, Amortized Cost
Securities Available-for-Sale, Due in one year or less, Amortized Cost	$ 2,261
Securities Available-for-Sale, Due after one year through five years, Amortized Cost	16,269
Securities Available-for-Sale, Due after five years through ten years, Amortized Cost	288,225
Securities Available-for-Sale, Due after ten years, Amortized Cost	800,278
Securities Available-for-Sale, Amortized Cost, Total	1,107,033
Securities Available-for-Sale, Estimated Fair Value
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	2,270
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	16,817
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	305,691
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	830,380
Securities Available-for-Sale, Estimated Fair Value, Total	$ 1,155,158

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