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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Tax benefit $ 1,273 $ 1,548 $ 1,515 $ 1,631 $ 5,967 $ 5,914 $ 5,191
Net income $ 3,468 $ 3,931 $ 3,873 $ 3,881 15,153 14,613 13,183
Parent Company [Member]              
Dividend income from subsidiaries         5,407 5,697 4,883
Equity in undistributed earnings of subsidiaries [1]         11,272 10,141 9,468
Bankshares expenses         (2,183) (1,705) (1,591)
Tax benefit         657 480 423
Net income         $ 15,153 $ 14,613 $ 13,183
[1] Amount in parentheses represents the excess of dividends over net income subsidiaries.