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Derivatives (Offsetting of Derivatives) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Gross Amounts Recognized $ 602,754 $ 330,316
Less: Master Netting Arrangements (93,063) (121,561)
Less: Cash collateral received or paid (8,449) (3,758)
Derivative asset, after netting 501,242 204,997
Less: Security Collateral Received (35) 0
Net derivative assets 501,207 204,997
Contracts not subject to master netting arrangements, gross amounts recognized 1,100 1,600
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount 15,800 3,800
Liabilities    
Gross Amounts Recognized 424,828 256,528
Less: Master Netting Arrangements (93,063) (121,561)
Less: Cash collateral received/paid (91,634) (38,238)
Derivative liability, after netting 240,131 96,729
Less: Security Collateral Pledged (221,150) (79,619)
Net derivative liabilities 18,981 17,110
Derivative liability subject to master netting arrangements, gross amounts recognized   256,528
Contracts not subject to master netting arrangements, gross amounts recognized 220 20
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount $ 91,600 $ 43,000