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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Investment securities gains					$ 200	$ 0	$ 0	$ 4,276
Equity Securities, FV-NI, Unrealized Loss									$ (298)
Interest expense	$ 7,917	$ 7,171	$ 5,607	$ 4,997	4,664	4,340	4,036	3,767	25,692	$ 16,805	$ 13,207
Merger related costs									13,257	0	0
Income tax benefit	2,646	5,606	5,358	4,405	14,972	7,003	6,812	7,647	18,015	36,435	25,083
Net Income Available to Common Shareholders	$ 10,713	$ 20,692	$ 20,979	$ 17,616	$ 9,669	$ 13,932	$ 14,685	$ 16,026	70,002	54,310	52,128
Total Comprehensive Income									63,821	56,677	48,948
Parent Company
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries									50,000	30,000	8,600
Investment securities gains									0	200	0
Equity Securities, FV-NI, Unrealized Loss									208
Other income									130	115	320
Income									50,338	30,315	8,920
Interest expense									880	765	683
Merger related costs									1,899
Other expenses									1,842	1,636	1,957
Expenses									4,621	2,401	2,640
Income Before Income Tax Benefit and Equity in Undistributed Net Income of Subsidiaries									45,717	27,914	6,280
Income tax benefit									(1,114)	(1,197)	(1,096)
Income Before Equity in Undistributed Net Income of Subsidiaries									46,831	29,111	7,376
Equity in undistributed net income of subsidiaries									23,171	25,199	44,752
Net Income Available to Common Shareholders									70,002	54,310	52,128
Total Comprehensive Income									$ 63,821	$ 56,677	$ 48,948