City Holding Company (Parent Company Only) Financial Information (Condensed Statements Of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Investment securities gains	$ 200	$ 0	$ 0	$ 4,276	$ 0	$ 2,668	$ 845	$ 0
Interest expense	4,664	4,340	4,036	3,767	3,504	3,268	3,264	3,169	$ 16,805	$ 13,207	$ 11,830
Income tax benefit	14,972	7,003	6,812	7,647	6,338	6,577	6,303	5,866	36,435	25,083	28,414
Net Income Available to Common Shareholders	$ 9,669	$ 13,932	$ 14,685	$ 16,026	$ 14,656	$ 13,232	$ 12,541	$ 11,702	54,310	52,128	54,097
Total Comprehensive Income									56,677	48,948	54,424
Parent Company
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries									30,000	8,600	48,950
Investment securities gains									200	0	0
Other income									115	320	22
Income									30,315	8,920	48,972
Interest expense									765	683	618
Other expenses									1,636	1,957	1,170
Expenses									2,401	2,640	1,788
Income Before Income Tax Benefit and Equity in Undistributed Net Income of Subsidiaries									27,914	6,280	47,184
Income tax benefit									(1,197)	(1,096)	(795)
Income Before Equity in Undistributed Net Income of Subsidiaries									29,111	7,376	47,979
Equity in undistributed net income of subsidiaries									25,199	44,752	6,118
Net Income Available to Common Shareholders									54,310	52,128	54,097
Total Comprehensive Income									$ 56,677	$ 48,948	$ 54,424