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Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Line of Credit Facility [Line Items]    
Credit facility interest and fees incurred $ 376 $ 123
Wells Fargo Bank Group Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Credit facility interest and fees incurred 105 123
Federal Home Loan Bank Of New York [Member]    
Line of Credit Facility [Line Items]    
Credit facility interest and fees incurred $ 271