Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Gross Amounts Recognized	$ 484,184	$ 602,754
Less: Master Netting Arrangements	(58,679)	(93,063)
Less: Cash collateral received or paid	(42,274)	(8,449)
Derivative asset, after netting	383,231	501,242
Less: Security Collateral Received	0	(35)
Net derivative assets	383,231	501,207
Contracts not subject to master netting arrangements, gross amounts recognized	587	1,100
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount	(47,000)	15,800
Liabilities
Gross Amounts Recognized	390,171	424,828
Less: Master Netting Arrangements	(58,679)	(93,063)
Less: Cash collateral received/paid	(174,048)	(91,634)
Derivative liability, after netting	157,444	240,131
Less: Security Collateral Pledged	(106,598)	(221,150)
Net derivative liabilities	50,846	18,981
Contracts not subject to master netting arrangements, gross amounts recognized	666	220
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount	$ 176,500	$ 91,600