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Borrowings and Related Interest (Schedule Of Underlying Assets Of Repurchase Agreements) (Details) - Financial Instruments Owned And Pledged As Collateral Type [Domain] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets Sold Under Agreements To Repurchase [Line Items]    
Cost of Underlying Securities $ 496,814 $ 207,506
Balance of Borrowing 454,723 192,500
Approximate Fair Value of Underlying Securities $ 487,181 $ 205,483
Weighted Average Interest Rate of Security 3.01% 3.03%
FNMA and FHLMC Certificates [Member]    
Assets Sold Under Agreements To Repurchase [Line Items]    
Cost of Underlying Securities $ 496,814 $ 207,506
Balance of Borrowing 454,723 192,500
Approximate Fair Value of Underlying Securities $ 487,181 $ 205,483
Weighted Average Interest Rate of Security 3.01% 3.03%