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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Available-for-sale Securities, debt maturities, within one year, Amortized Cost	$ 25,169		$ 143,462
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost	223,518		134,040
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost	213,452		247,907
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost	458,386		429,921
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost	1,295,493		1,229,009
Available-for-sale Securities, debt maturities, Amortized Cost	2,216,018		2,184,339
Available-for-sale Securities, debt maturities, within one year, Fair Value	25,321	[1]	144,362
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value	230,667		137,625
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value	222,208		266,139
Available-for-sale Securities, debt maturities, after five through ten years, fair value	461,232	[1]	435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	1,303,037	[1]	1,247,060
Available-for-sale Securities, debt maturities, Fair Value	2,242,465	[1]	2,230,297
Held-to-maturity Securities, debt maturities, after three through five years, Amortized Cost			17,460
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost	2,267,811		1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost	3,080,010		2,167,485
Held-to-maturity Securities, Amortized cost	5,347,821		4,117,384
Held-to-maturity Securities, debt maturities, after three through five years, Fair Value			17,460
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value	2,267,120		1,926,425
Held-to-maturity Securities, debt maturities, after ten years, Fair Value	3,087,009		2,164,075
Held-to-maturity Securities, debt maturities, Fair Value	$ 5,354,129		$ 4,107,960
[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.

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