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Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Derivative Assets |  |
Gross Amounts Recognized | $ 358,639 | $ 107,816
Less: Master netting agreements | (62,741) | (31,569)
Less: Cash collateral received/pledged | (6,587) | (13,577)
Derivative asset, after netting | 289,311 | 62,670
Less: Security Collateral Received | 0 | (13,975)
Net derivative assets | 289,311 | 48,695
Derivative assets subject to master netting arrangements, gross amounts recognized | 357,000 | 105,900
Contracts not subject to master netting arrangements, gross amounts recognized | 1,600 | 2,000
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount | 7,200 | 15,800
Amount used to offset against derivative assets | 6,587 | 13,577
Derivative Liabilities |  |
Gross Amounts Recognized | 263,734 | 118,305
Less: Master netting agreements | (62,741) | (31,569)
Less: Cash collateral received/pledged | (47,979) | (6,833)
Derivative liability, after netting | 153,014 | 79,903
Less: Security Collateral Pledged | (113,365) | (11,231)
Net derivative liabilities | 39,649 | 68,672
Derivative liability subject to master netting arrangements, gross amounts recognized | 263,700 | 118,200
Contracts not subject to master netting arrangements, gross amounts recognized | 67 | 102
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount | 50,900 | 8,400
Amount used to offset against derivative liabilities | $ 47,979 | $ 6,833

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