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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
Mar. 31, 2020
Dec. 31, 2019
Assets Sold Under Agreements To Repurchase [Line Items]    
Amortized Cost of Underlying Securities $ 54,054 $ 204,225
Balance of Borrowing 50,000 190,000
Approximate Fair Value of Underlying Securities $ 54,756 $ 204,068
Weighted Average Interest Rate of Security 3.12% 2.98%
FNMA and FHLMC Certificates [Member]    
Assets Sold Under Agreements To Repurchase [Line Items]    
Amortized Cost of Underlying Securities $ 54,054 $ 204,225
Balance of Borrowing 50,000 190,000
Approximate Fair Value of Underlying Securities $ 54,756 $ 204,068
Weighted Average Interest Rate of Security 3.12% 2.98%