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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]  
Summary Of Supplemental Cash Flow Information
    2016     2015     2014
Cash payments:                
Interest expense $ 11,823   $ 9,323   $ 6,826
Income taxes   10,555     7,494     13,665
Noncash investing and financing activities:                
Real estate and other assets acquired in settlement of loans $ 496   $ 374   $ 394
Accrued and declared unpaid dividends   3,403     3,185     3,177
(Decrease) increase in net unsettled security purchases   (170 )   (478 )   568
Securities transferred from available for sale to held to maturity   -     165,238     12,802
Loans transferred from held for sale to held for investment   -     -     853
Common stock issued for acquisition   8,100     -     5,400
Assets acquired and liabilities assumed in business combinations:                
Loans and other non-cash assets, excluding goodwill and core                
deposit intangible asset   4,848     -     1,007
Deposits and other liabilities   1,845     -     1,112