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Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities Received as Collateral $ 112,000 $ 128,000
Securities for Reverse Repurchase Agreements 554,806 413,819
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 530,932 417,550
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 28,600 31,200
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 366,663 377,820
Securities Loaned, Fair Value of Collateral 102,618 121,551
Securities for Reverse Repurchase Agreements 554,589 428,344
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities Borrowed 335,781 358,875
Securities Loaned, Fair Value of Collateral $ 101,981 $ 117,246