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Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Derivative Assets |  |
Gross Amounts Recognized | $ 242,876 | $ 107,816
Less: Master netting agreements | (40,372) | (31,569)
Less: Cash collateral received/pledged | (3,831) | (13,577)
Derivative asset, after netting | 198,673 | 62,670
Less: Security Collateral Received | 0 | (13,975)
Net derivative assets | 198,673 | 48,695
Derivative assets subject to master netting arrangements, gross amounts recognized | 240,800 | 105,900
Contracts not subject to master netting arrangements, gross amounts recognized | 2,100 | 2,000
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount | 4,600 | 15,800
Amount used to offset against derivative assets | 3,831 | 13,577
Derivative Liabilities |  |
Gross Amounts Recognized | 172,923 | 118,305
Less: Master netting agreements | (40,372) | (31,569)
Less: Cash collateral received/pledged | (34,122) | (6,833)
Derivative liability, after netting | 98,429 | 79,903
Less: Security Collateral Pledged | (76,434) | (11,231)
Net derivative liabilities | 21,995 | 68,672
Derivative liability subject to master netting arrangements, gross amounts recognized | 172,900 | 118,200
Contracts not subject to master netting arrangements, gross amounts recognized | 17 | 102
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount | 36,400 | 8,400
Amount used to offset against derivative liabilities | $ 34,122 | $ 6,833

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