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Fair Value Measurement (Summary Of Changes In Fair Value At Level 3, Mortgage Servicing Rights) (Details) - Mortgage Servicing Rights [Member] - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Mortgage servicing rights, beginning $ 555 $ 609
Gains/(Losses) included in earnings (103) (40)
Additions from loan sales 33 18
Mortgage servicing rights, ending $ 485 $ 587