Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 210,688	$ 342,510
Derivative Liability	9,661	8,782
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Asset Derivatives	8,258	28,144
Interest rate forward sales commitments
Derivatives, Fair Value [Line Items]
Asset Derivatives	3,367	7
Derivative Liability	374	7,257
Interest rate swaps
Derivatives, Fair Value [Line Items]
Asset Derivatives	198,607	313,090
Derivative Liability	8,944	370
Interest rate contracts | Interest rate lock commitments | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	8,258	28,144
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	3,367	7
Interest rate contracts | Interest rate forward sales commitments | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	374	7,257
Interest rate contracts | Interest rate swaps | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	198,607	313,090
Interest rate contracts | Interest rate swaps | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	8,944	370
Foreign currency derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives	456	1,269
Derivative Liability	343	1,155
Foreign currency derivatives | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	456	1,269
Foreign currency derivatives | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 343	$ 1,155