Regulatory Requirements And Capital Ratios (Schedule Of Capital Amounts And Ratios) (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 598,068	$ 555,532
CET1 ratio	0.162	0.161
CET1 capital, minimum capital required basel III fully phased in	$ 257,965	$ 241,772
CET1 ratio, minimum capital required basel III fully phased in	7.00%	7.00%
CET1 capital, required to be well-capitalized	$ 239,538	$ 224,503
CET1 ratio, required to be well capitalized	6.50%	6.50%
Tier I capital	$ 598,068	$ 555,532
Tier I capital, ratio	0.162	0.161
Tier 1, capital, minimum capital required basel III fully phased in	$ 313,243	$ 293,581
Tier 1, ratio, minimum capital required basel III fully phased in	8.50%	8.50%
Tier 1, capital, required to be well-capitalized	$ 294,817	$ 276,311
Tier 1, ratio, required to be well-capitalized	0.080	0.080
Total capital	$ 612,654	$ 570,336
Total capital, ratio	0.166	0.165
Total capital, minimum capital required basel III fully phased in	$ 386,947	$ 362,659
Total capital, ratio, minimum capital required basel III fully phased in	10.50%	10.50%
Total capital, required to be well-capitalized	$ 368,521	$ 345,389
Total capital, ratio, required to be well-capitalized	0.100	0.100
Tier 1 Leverage Capital, Average Assets	$ 598,068	$ 555,532
Tier I Leverage Ratio, Average Assets	0.100	0.094
Tier 1 Leverage Capital, minimum capital required basel III fully phased in	$ 238,954	$ 235,403
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	$ 298,692	$ 294,254
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	$ 508,586	$ 492,721
CET1 ratio	0.139	0.144
CET1 capital, minimum capital required basel III fully phased in	$ 256,520	$ 240,392
CET1 ratio, minimum capital required basel III fully phased in	7.00%	7.00%
CET1 capital, required to be well-capitalized	$ 238,197	$ 223,221
CET1 ratio, required to be well capitalized	6.50%	6.50%
Tier I capital	$ 508,586	$ 492,721
Tier I capital, ratio	0.139	0.144
Tier 1, capital, minimum capital required basel III fully phased in	$ 311,488	$ 291,905
Tier 1, ratio, minimum capital required basel III fully phased in	8.50%	8.50%
Tier 1, capital, required to be well-capitalized	$ 293,166	$ 274,734
Tier 1, ratio, required to be well-capitalized	0.080	0.080
Total capital	$ 523,172	$ 507,526
Total capital, ratio	0.143	0.148
Total capital, minimum capital required basel III fully phased in	$ 384,780	$ 360,588
Total capital, ratio, minimum capital required basel III fully phased in	10.50%	10.50%
Total capital, required to be well-capitalized	$ 366,457	$ 343,418
Total capital, ratio, required to be well-capitalized	0.100	0.100
Tier 1 Leverage Capital, Average Assets	$ 508,586	$ 492,721
Tier I Leverage Ratio, Average Assets	0.086	0.085
Tier 1 Leverage Capital, minimum capital required basel III fully phased in	$ 237,973	$ 233,342
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	$ 297,466	$ 291,678
Tier 1 Leverage Capital, Average Assets, Well Capitalized Ratio	0.050	0.050