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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Sep. 30, 2019  
Securities Loaned, Fair Value of Collateral $ 104,191 $ 102,618
Securities Received as Collateral 107,000 112,000
Securities for Reverse Repurchase Agreements 610,701 554,806
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 624,348 530,932
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 335,408 335,781
Securities Loaned, Fair Value of Collateral 97,606 101,981
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 372,617 366,663
Securities for Reverse Repurchase Agreements $ 644,471 $ 554,589