Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 383,171	$ 150,574
Derivative Liability	3,433	8,808
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Asset Derivatives	28,839	7,056
Interest rate forward sales commitments
Derivatives, Fair Value [Line Items]
Asset Derivatives	814	105
Derivative Liability	2,843	1,351
Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset Derivatives	352,956	142,787
Derivative Liability	65	7,001
Interest rate contracts | Interest rate lock commitments | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	28,839	7,056
Interest rate contracts | Interest rate lock commitments | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0	0
Interest rate contracts | Interest rate forward sales commitments | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	814	105
Interest rate contracts | Interest rate forward sales commitments | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	2,843	1,351
Interest rate contracts | Interest rate swaps | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	352,956	142,787
Interest rate contracts | Interest rate swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	65	7,001
Foreign currency derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives	562	626
Derivative Liability	525	456
Foreign currency derivatives | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	562	626
Foreign currency derivatives | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 525	$ 456