Investment Securities (Interest And Dividends On Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Securities [Abstract]
Taxable interest and dividends	$ 17,886	$ 17,025	$ 16,123
Tax-exempt interest and dividends	5,869	5,892	5,752
Total interest and dividends on securities	$ 23,755	$ 22,917	$ 21,875