Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets	$ 342,510	$ 150,574
Total liability derivatives	8,782	8,808
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Derivative assets	28,144	7,056
Interest rate forward sales commitments
Derivatives, Fair Value [Line Items]
Derivative assets	7	105
Total liability derivatives	7,257	1,351
Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative assets	313,090	142,787
Total liability derivatives	370	7,001
Interest Rate Contracts | Interest rate lock commitments | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	28,144	7,056
Interest Rate Contracts | Interest rate lock commitments | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	0	0
Interest Rate Contracts | Interest rate forward sales commitments | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	7	105
Interest Rate Contracts | Interest rate forward sales commitments | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	7,257	1,351
Interest Rate Contracts | Interest rate swaps | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	313,090	142,787
Interest Rate Contracts | Interest rate swaps | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	370	7,001
Foreign currency derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	1,269	626
Total liability derivatives	1,155	456
Foreign currency derivatives | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	1,269	626
Foreign currency derivatives | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	$ 1,155	$ 456