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Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Net Amounts of Assets Presented in the Statement of Financial Position $ 53,676 $ 52,691
Liabilities    
Gross Amounts of Recognized Liabilities 5,451,516 4,305,165
Net Amounts of Liabilities Presented in the Statement of Financial 5,451,516 4,305,165
Gross Amounts Not Offset in the Statement of Financial Position    
Financial Instruments 5,443,170 4,291,158
Cash Collateral Pledged 7,907 8,658
Net Amount 439 5,349
Derivatives    
Assets    
Gross Amounts of Recognized Assets 53,676 52,691
Net Amounts of Assets Presented in the Statement of Financial Position 53,676 52,691
Gross Amounts Not Offset in the Statement of Financial Position    
Financial Instruments 545 1,408
Cash Collateral Received 13,814  
Net Amount 39,317 51,283
Liabilities    
Gross Amounts of Recognized Liabilities 8,891 15,415
Net Amounts of Liabilities Presented in the Statement of Financial 8,891 15,415
Gross Amounts Not Offset in the Statement of Financial Position    
Financial Instruments 545 1,408
Cash Collateral Pledged 7,907 8,658
Net Amount 439 5,349
Repurchase agreements    
Liabilities    
Gross Amounts of Recognized Liabilities 5,442,625 4,289,750
Net Amounts of Liabilities Presented in the Statement of Financial 5,442,625 4,289,750
Gross Amounts Not Offset in the Statement of Financial Position    
Financial Instruments $ 5,442,625 $ 4,289,750