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Loans Held For Sale And Loan Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2016
Loans Held For Sale And Loan Servicing Rights [Abstract]  
Activity In Capitalized Mortgage Servicing Assets
    2016     2015     2014  
Mortgage servicing assets, beginning of year $ 1,225   $ 1,335   $ 1,479  
Originations   150     166     172  
Amortization   (298 )   (276 )   (316 )
Mortgage servicing assets, end of year   1,077     1,225     1,335  
Valuation allowance   (2 )   (1 )   (6 )
Mortgage servicing assets, net, end of year $ 1,075   $ 1,224   $ 1,329