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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