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Derivatives (Offsetting of Derivatives) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivatives Assets    
Total Gross Amounts $ 81,456 $ 66,146
Gross Amounts of Contracts Not Subject to Master Netting Arrangements 27,141 36,941
Gross Amounts of Contracts Subject to Master Netting Arrangements 54,315 29,205
Gross Amounts Offset on the Consolidated Balance Sheet 0 0
Net Amounts Presented on the Consolidated Balance Sheet 54,315 29,205
Gross Amounts Not Offset on the Consolidated Balance Sheet    
Derivative Amount (18,672) (18,955)
Collateral Received (33,615) (9,839)
Net Amount 2,028 411
Cash collateral received 10,100 8,600
Derivatives Liabilities    
Total Gross Amounts 114,542 74,935
Gross Amounts of Contracts Not Subject to Master Netting Arrangements 82,965 26,732
Gross Amounts of Contracts Subject to Master Netting Arrangements 31,577 48,203
Gross Amounts Offset on the Consolidated Balance Sheet 0 0
Net Amounts Presented on the Consolidated Balance Sheet 31,577 48,203
Gross Amounts Not Offset on the Consolidated Balance Sheet    
Derivative Amounts (18,672) (18,955)
Collateral Pledged (12,889) (28,796)
Net Amount 16 452
Cash collateral posted $ 4,100 $ 10,700