Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 36,790	$ 61,529
Gross Amounts Offset in the Statement of Financial Position, Derivative Assets	(29,882)	(58,660)
Net Amounts Presented in the Statement of Financial Position, Derivative Assets	6,908	2,869
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Assets	6,908	2,869
Gross Amounts Not offset in the Statement of Financial Position - Cash Collateral, Derivative Assets	0	0
Net Amounts Presented in the Statement of Financial Position, Derivative Assets	0	0
Gross Amounts Recognized, Derivative Liabilities	85,448	171,275
Gross Amounts Offset in the Statement of Financial Position, Derivative Liabilities	(63,204)	(126,434)
Net Amounts Presented in the Statement of Financial Position, Derivative Liabilities	22,244	44,841
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Liabilities	6,908	2,869
Gross Amounts Not Offset in the Statement of Financial Position - Cash Collateral, Derivative Liabilities	66,207	90,312
Gross Amounts Not Offset in the Statement of Financial Position - Net Amount, Derivatives Liabilities	$ (50,871)	$ (48,340)