Derivatives (Summary Of Types Of Derivatives And Gains (Losses) Recorded) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (47,300)	$ (15,758)	$ 11,460
Interest Rate Contracts | Interest rate lock commitments | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	21,088	298	2,006
Interest Rate Contracts | Interest rate forward sales commitments | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(61,403)	(12,096)	9,144
Interest Rate Contracts | Interest rate swaps | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(9,409)	(6,038)	(1,362)
Foreign currency derivatives | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 2,424	$ 2,078	$ 1,672