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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract]  
Summary Of Supplemental Cash Flow Information
    2017   2016     2015  
Cash payments:                
Interest expense $ 14,850 $ 11,823   $ 9,323  
Income taxes   13,187   10,555     7,494  
Noncash investing and financing activities:                
Real estate and other assets acquired in settlement of loans $ 426 $ 496   $ 374  
Accrued and declared unpaid dividends   3,859   3,403     3,185  
Increase (decrease) in net unsettled security purchases   -   (170 )   (478 )
Securities transferred from available for sale to held to maturity   -   -     165,238  
Common stock issued for acquisition   -   8,100     -  
Assets acquired and liabilities assumed in business combinations:                
Loans and other non-cash assets, excluding goodwill and other                
intangible assets   812   4,848     -  
Deposits and other liabilities   44   1,845     -