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Summary Of Significant Accounting Policies (Summary Of Supplemental Cash Flow Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]      
Interest expense $ 11,823 $ 9,323 $ 6,826
Income taxes 10,555 7,494 13,665
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
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