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Fair Value (Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure $ 0   $ 0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income 13 $ 5 $ 28 $ 14        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis    
The tables below present a reconciliation of the beginning and ending balances of the Level 3 inputs for the three months and nine months ended September 30, 2020 and 2019, for financial instruments measured on a recurring basis and classified as Level 3:

Level 3 Fair Value Measurements
Three months ended September 30, 2020 and 2019
(In thousands)Equity
Securities		Fair value
swap
Balance at July 1, 2020$471 $(226)
Total gains  
Included in other income13 — 
Balance at September 30, 2020$484 $(226)
Balance at July 1, 2019$433 $(226)
Total gains  
Included in other income5 — 
Balance at September 30, 2019$438 $(226)

Level 3 Fair Value Measurements
Nine months ended September 30, 2020 and 2019

(In thousands)Equity
Securities		Fair value
swap
Balance at January 1, 2020$456 $(226)
Total gains  
Included in other income28 — 
Balance at September 30, 2020$484 $(226)
Balance at January 1, 2019$424 $(226)
Total gains  
Included in other income14 — 
Balance at September 30, 2019$438 $(226)
          
Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 2,042   $ 2,042     $ 1,993    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 484   484     456    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 484 438 484 438 $ 471 456 $ 433 $ 424
Balance, ending 484 438 484 438 471 456 433 424
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Swap [Member]                
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning (226) (226) (226) (226) (226) (226) (226) (226)
Included in other comprehensive income   0   0        
Balance, ending $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226)