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Contingent Liabilities And Commitments (Summary Of Commitments And Contingent Liabilities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Loss Contingencies [Line Items]      
Commitments and contingent liabilities $ 345,814   $ 336,283
Losses on commitments 0 $ 0  
Reserve for commitments 0 $ 0  
Commitments To Extend Credit [Member]      
Loss Contingencies [Line Items]      
Commitments and contingent liabilities 342,133   331,974
Standby Letters Of Credit [Member]      
Loss Contingencies [Line Items]      
Commitments and contingent liabilities $ 3,681   $ 4,309