Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - Non-hedging interest rate derivatives: - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Assets | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 37,911	$ (2,879)
Other Liabilities | Other Income [Member]
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(37,911)	2,879
Other Liabilities | Other Expense
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 172	$ 58