Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Securities Available-for-Sale, Amortized Cost
Due in one year or less	$ 4,121
Due after one year through five years	41,677
Due after five years through ten years	261,225
Due after ten years	998,143
Total	1,305,166
Securities Available-for-Sale, Estimated Fair Value
Due in one year or less	4,176
Due after one year through five years	43,217
Due after five years through ten years	275,126
Due after ten years	1,016,917
Total	$ 1,339,436