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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Securities Loaned, Fair Value of Collateral $ 100,665 $ 102,618
Securities Received as Collateral 107,000 112,000
Securities for Reverse Repurchase Agreements 548,100 554,806
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 558,523 530,932
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 339,593 335,781
Securities Loaned, Fair Value of Collateral 97,510 101,981
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 371,473 366,663
Securities for Reverse Repurchase Agreements $ 558,981 $ 554,589