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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