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Derivatives (Offsetting of Derivatives) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivatives Assets    
Gross amounts recognized - Fair value $ 99,103 $ 66,146
Gross Amounts of Contracts Not Subject to Master Netting Arrangements 2,751 2,322
Gross Amounts of Contracts Subject to Master Netting Arrangements 96,352 63,824
Gross Amounts Offset on the Consolidated Balance Sheet 0 0
Net Amounts Presented on the Consolidated Balance Sheet 96,352 63,824
Net Amount 24,620 33,743
Gross Amounts Not Offset on the Consolidated Balance Sheet    
Derivative Amount (19,470) (20,242)
Collateral Received (52,262) (9,839)
Cash collateral received 10,900 8,600
Derivatives Liabilities    
Gross amounts recognized - Fair value 133,702 74,935
Gross Amounts of Contracts Not Subject to Master Netting Arrangements 88 523
Gross Amounts of Contracts Subject to Master Netting Arrangements 133,614 74,412
Gross Amounts Offset on the Consolidated Balance Sheet 0 0
Net Amounts Presented on the Consolidated Balance Sheet 133,614 74,412
Net Amount 103,213 25,374
Gross Amounts Not Offset on the Consolidated Balance Sheet    
Derivative Amounts (19,470) (20,242)
Collateral Pledged (10,931) (28,796)
Cash collateral posted $ 3,400 $ 10,700