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Loans Held For Sale And Loan Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2017
Loans Held For Sale And Loan Servicing Rights [Abstract]  
Activity In Capitalized Mortgage Servicing Assets
    2017     2016     2015  
Mortgage servicing assets, beginning of year $ 1,077   $ 1,225   $ 1,335  
Originations   231     150     166  
Amortization   (318 )   (298 )   (276 )
Mortgage servicing assets, end of year   990     1,077     1,225  
Valuation allowance   -     (2 )   (1 )
Mortgage servicing assets, net, end of year $ 990   $ 1,075   $ 1,224