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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Equity Securities, FV-NI, Unrealized Loss									$ 957	$ (90)	$ 4,476
Interest expense	$ 8,701	$ 9,444	$ 9,327	$ 8,867	$ 7,917	$ 7,171	$ 5,607	$ 4,997	36,339	25,692	16,805
Merger related costs									797	13,257	0
Income tax benefit	6,319	6,193	5,813	5,810	2,646	5,606	5,358	4,405	24,135	18,015	36,435
Net Income Available to Common Shareholders	$ 22,611	$ 22,371	$ 22,751	$ 21,619	$ 10,713	$ 20,692	$ 20,979	$ 17,616	89,352	70,002	54,310
Total Comprehensive Income									109,674	63,821	56,677
Parent Company
Condensed Financial Statements, Captions [Line Items]
Dividend Income, Operating									58,000	50,000	30,000
Equity Securities, FV-NI, Unrealized Loss									425	208	200
Other income									151	130	115
Income									58,576	50,338	30,315
Interest expense									182	880	765
Merger related costs									0	1,899	0
Other expenses									1,794	1,842	1,636
Expenses									1,976	4,621	2,401
Income Before Income Tax Benefit and Equity in Undistributed Net Income of Subsidiaries									56,600	45,717	27,914
Income tax benefit									(455)	(1,114)	(1,197)
Income Before Equity in Undistributed Net Income of Subsidiaries									57,055	46,831	29,111
Equity in undistributed net income of subsidiaries									32,297	23,171	25,199
Net Income Available to Common Shareholders									89,352	70,002	54,310
Total Comprehensive Income									$ 109,674	$ 63,821	$ 56,677