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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities Loaned, Fair Value of Collateral $ 102,489 $ 121,551
Securities Received as Collateral 112,000 128,000
Securities for Reverse Repurchase Agreements 408,679 413,819
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 400,515 417,550
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 353,650 358,875
Securities Loaned, Fair Value of Collateral 101,965 117,246
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 370,323 377,820
Securities for Reverse Repurchase Agreements $ 404,905 $ 428,344