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Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives Assets |  |
Total Gross Amounts | $ 59,831 | $ 66,146
Gross Amounts of Contracts Not Subject to Master Netting Arrangements | 20,954 | 36,941
Gross Amounts of Contracts Subject to Master Netting Arrangements | 38,877 | 29,205
Gross Amounts Offset on the Consolidated Balance Sheet | 0 | 0
Net Amounts Presented on the Consolidated Balance Sheet | 38,877 | 29,205
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |
Derivative Amount | (12,957) | (18,955)
Collateral Received | (23,810) | (9,839)
Net Amount | 2,110 | 411
Cash collateral received | 6,900 | 8,600
Derivatives Liabilities |  |
Total Gross Amounts | 86,673 | 74,935
Gross Amounts of Contracts Not Subject to Master Netting Arrangements | 61,135 | 26,732
Gross Amounts of Contracts Subject to Master Netting Arrangements | 25,538 | 48,203
Gross Amounts Offset on the Consolidated Balance Sheet | 0 | 0
Net Amounts Presented on the Consolidated Balance Sheet | 25,538 | 48,203
Gross Amounts Not Offset on the Consolidated Balance Sheet |  |
Derivative Amounts | (12,957) | (18,955)
Collateral Posted | (12,038) | (28,796)
Net Amount | 543 | 452
Cash collateral posted | $ 1,500 | $ 10,700

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