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Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Credit facility interest and fees incurred $ 815 $ 420 $ 420
Wells Fargo Bank Group Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility interest and fees incurred 664 420 420
Federal Home Loan Bank Of New York [Member]      
Line of Credit Facility [Line Items]      
Credit facility interest and fees incurred $ 151