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Derivative Financial Instruments Balance Sheet Offsetting (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Offsetting Assets and Liabilities [Line Items]    
Gross asset $ 61,688 $ 43,630
Financial Instruments (13,085) (17,028)
Cash collateral (23,270) 0
Net asset 25,333 26,602
Derivative liabilities 47,237 38,997
Financial Instruments (22,916) (17,028)
Cash Collateral (22,786) (6,588)
Net liability 1,535 15,381
Interest Rate Swap    
Offsetting Assets and Liabilities [Line Items]    
Gross asset 61,401 43,446
Financial Instruments (12,955) (16,844)
Cash collateral (23,270) 0
Net asset 25,176 26,602
Derivative liabilities 47,107 38,742
Financial Instruments (22,786) (16,844)
Cash Collateral (22,786) (6,588)
Net liability 1,535 15,310
Foreign Exchange Contract    
Offsetting Assets and Liabilities [Line Items]    
Gross asset 287 184
Financial Instruments (130) (184)
Cash collateral 0 0
Net asset 157 0
Derivative liabilities 130 255
Financial Instruments (130) (184)
Cash Collateral 0 0
Net liability $ 0 $ 71