Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Investments [Abstract]
Securities Available-for-Sale, Due in one year or less, Cost	$ 15,521,000
Securities Available-for-Sale, Due after one year through five years, Cost	153,680,000
Securities Available-for-Sale, Due after five years through ten years, Cost	316,167,000
Securities Available-for-Sale, Due after ten years, Cost	1,085,081,000
Securities Available-for-Sale, Cost, Total	1,570,449,000	$ 1,479,545,000
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	15,409,000
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	145,551,000
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	293,665,000
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	966,681,000
Debt Securities, Available-for-sale, Total	$ 1,421,306,000	$ 1,338,137,000