Regulatory Requirements And Capital Ratios (Schedule Of Capital Amounts And Ratios) (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 555,532	$ 557,641
CET1 ratio	0.161	0.162
CET1 capital, minimum capital required basel III fully phased in	$ 241,772	$ 241,221
CET1 ratio, minimum capital required basel III fully phased in	7.00%	7.00%
CET1 capital, required to be well-capitalized	$ 224,503	$ 223,991
CET1 ratio, required to be well capitalized	6.50%	6.50%
Tier I capital	$ 555,532	$ 557,641
Tier I capital, ratio	0.161	0.162
Tier 1, capital, minimum capital required basel III fully phased in	$ 293,581	$ 292,911
Tier 1, ratio, minimum capital required basel III fully phased in	8.50%	8.50%
Tier 1, capital, required to be well-capitalized	$ 276,311	$ 275,681
Tier 1, ratio, required to be well-capitalized	0.080	0.080
Total capital	$ 570,336	$ 577,292
Total capital, ratio	0.165	0.168
Total capital, minimum capital required basel III fully phased in	$ 362,659	$ 361,831
Total capital, ratio, minimum capital required basel III fully phased in	10.50%	10.50%
Total capital, required to be well-capitalized	$ 345,389	$ 344,601
Total capital, ratio, required to be well-capitalized	0.100	0.100
Tier 1 Leverage Capital, Average Assets	$ 555,532	$ 557,641
Tier I Leverage Ratio, Average Assets	0.094	0.102
Tier 1 Leverage Capital, minimum capital required basel III fully phased in	$ 235,403	$ 218,163
Tier 1 Leverage Ratio, minimum capital required basel III fully phased in	4.00%	4.00%
Tier 1 Leverage Capital Required to be Well Capitalized	$ 294,254	$ 272,704
Tier 1 Leverage Capital, Average Assets, Well Capitalized Ratio	0.050	0.050
City National
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 492,721	$ 482,754
CET1 ratio	0.144	0.141
CET1 capital, minimum capital required basel III fully phased in	$ 240,392	$ 239,569
CET1 ratio, minimum capital required basel III fully phased in	7.00%	7.00%
CET1 capital, required to be well-capitalized	$ 223,221	$ 222,457
CET1 ratio, required to be well capitalized	6.50%	6.50%
Tier I capital	$ 492,721	$ 482,754
Tier I capital, ratio	0.144	0.141
Tier 1, capital, minimum capital required basel III fully phased in	$ 291,905	$ 290,906
Tier 1, ratio, minimum capital required basel III fully phased in	8.50%	8.50%
Tier 1, capital, required to be well-capitalized	$ 274,734	$ 273,793
Tier 1, ratio, required to be well-capitalized	0.080	0.080
Total capital	$ 507,526	$ 502,405
Total capital, ratio	0.148	0.147
Total capital, minimum capital required basel III fully phased in	$ 360,588	$ 359,354
Total capital, ratio, minimum capital required basel III fully phased in	10.50%	10.50%
Total capital, required to be well-capitalized	$ 343,418	$ 342,242
Total capital, ratio, required to be well-capitalized	0.100	0.100
Tier 1 Leverage Capital, Average Assets	$ 492,721	$ 482,754
Tier I Leverage Ratio, Average Assets	0.085	0.090
Tier 1 Leverage Capital, minimum capital required basel III fully phased in	$ 233,342	$ 215,277
Tier 1 Leverage Ratio, minimum capital required basel III fully phased in	4.00%	4.00%
Tier 1 Leverage Capital Required to be Well Capitalized	$ 291,678	$ 269,097
Tier 1 Leverage Capital, Average Assets, Well Capitalized Ratio	0.050	0.050