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Condensed Financial Information - Parent Company Only (Statements Of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Tax benefit $ 426 $ 1,850 $ 1,804 $ 1,796 $ 5,876 $ 5,967 $ 5,914
Net income $ 2,584 $ 3,632 $ 4,311 $ 4,406 14,933 15,153 14,613
Parent Company [Member]              
Dividend income from subsidiaries         6,473 5,407 5,697
Equity in undistributed earnings of subsidiaries         10,380 11,272 10,141
Bankshares expenses         (2,949) (2,183) (1,705)
Tax benefit         1,029 657 480
Net income         $ 14,933 $ 15,153 $ 14,613