Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale			$ 1,101,782		$ 85,023
Proceeds From Sale Of Other Securities			40,167		3,907
Total proceeds			1,141,949		88,930
Investment securities gains (losses), net	$ 4,298	$ 3,410	7,384	[1]	11,602	[1]
Available-for-sale Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Gains realized on sales			143		0
Available-for-sale Securities, Losses realized on sales			(8,587)		(20,274)
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)			(757)		(1,048)
Other Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Other Securities, Gains realized on sales			884		104
Other Securities, Loss realized on sales			(1,245)		(4,313)
Fair value other securities adjustments, net			$ 16,946		$ 37,133

[1] Available for sale debt securities, equity securities, and other securities.