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Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Gross Amounts Recognized | $ 66,146 | $ 83,780
Contracts Not Subject to Master Netting Arrangements, Gross Amounts of Recognized | 36,941 | 51,218
Contracts Subject to Master Netting Agreements, Gross Amounts of Recognized | 29,205 | 32,562
Contracts Subject to Master Netting Agreements, Gross Amounts Offset on the Consolidated Balance Sheets | 0 | 0
Contracts Subject to Master Netting Arrangements, Net Amounts Presented on the Consolidated Balance Sheets | 29,205 | 32,562
Contracts Subject to Master Netting Arrangements, Gross Amounts Not Offset on the Consolidated Balance Sheets |  |
Derivative Amounts | (18,955) | (20,991)
Collateral Received | (9,839) | (10,687)
Contracts Subject to Master Netting Arrangements, Net Amount | 411 | 884
Cash collateral received | 8,600 | 8,100
Liabilities |  |
Gross Amounts Recognized | 74,935 | 82,323
Contracts Not Subject to Master Netting Arrangements, Gross Amounts of Recognized | 26,732 | 24,097
Contracts Subject to Master Netting Agreements, Gross Amounts of Recognized | 48,203 | 58,226
Contracts Subject to Master Netting Agreements, Gross Amounts Offset on the Consolidated Balance Sheets | 0 | 0
Contracts Subject to Master Netting Arrangements, Net Amounts Presented on the Consolidated Balance Sheets | 48,203 | 58,226
Contracts Subject to Master Netting Arrangements, Gross Amounts Not Offset on the Consolidated Balance Sheets |  |
Derivative Amounts | (18,955) | (20,991)
Collateral Posted | (28,796) | (36,349)
Contracts Subject to Master Netting Arrangements, Net Amount | 452 | 886
Cash collateral posted | $ 10,700 | $ 170

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