Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 65,960	$ 27,938
Gross Amounts Offset in the Statement of Income, Derivative Assets	(65,957)	(27,915)
Net Amounts Presented in the Statement of Income, Derivative Assets	3	23
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Assets	3	23
Gross Amounts Recognized, Derivative Liabilities	207,355	56,523
Gross Amounts Offset in the Statement of Income, Derivative Liabilities	(159,856)	(44,570)
Net Amounts Presented in the Statement of Income, Derivative Liabilities	47,499	11,953
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Liabilities	3	23
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Liabilities	85,500	35,113
Net Amounts Presented in the Statement of Income, Derivative Liabilities	$ (38,004)	$ (23,183)