Regulatory Requirements And Capital Ratios (Schedule Of Capital Amounts And Ratios) (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital	$ 688,707	$ 627,579
CET1 ratio	0.165	0.157
CET1 capital, minimum capital required basel III fully phased in	$ 291,989	$ 279,768
CET1 ratio, minimum capital required basel III fully phased in	7.00%	7.00%
CET1 capital, required to be well-capitalized	$ 271,133	$ 259,875
CET1 ratio, required to be well capitalized	6.50%	6.50%
Tier I capital	$ 688,707	$ 627,579
Tier I capital, ratio	0.165	0.157
Tier 1, capital, minimum capital required basel III fully phased in	$ 354,558	$ 339,718
Tier 1, ratio, minimum capital required basel III fully phased in	8.50%	8.50%
Tier 1, capital, required to be well-capitalized	$ 333,702	$ 319,735
Tier 1, ratio, required to be well-capitalized	0.080	0.080
Total capital	$ 709,820	$ 648,646
Total capital, ratio	0.170	0.162
Total capital, minimum capital required basel III fully phased in	$ 437,983	$ 419,652
Total capital, ratio, minimum capital required basel III fully phased in	10.50%	10.50%
Total capital, required to be well-capitalized	$ 417,127	$ 399,669
Total capital, ratio, required to be well-capitalized	0.100	0.100
Tier 1 Leverage Capital, Average Assets	$ 688,707	$ 627,579
Tier I Leverage Ratio, Average Assets	0.106	0.102
Tier 1 Leverage Capital, minimum capital required basel III fully phased in	$ 259,325	$ 245,468
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	$ 324,156	$ 306,835
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	$ 563,301	$ 549,031
CET1 ratio	0.136	0.138
CET1 capital, minimum capital required basel III fully phased in	$ 291,068	$ 278,692
CET1 ratio, minimum capital required basel III fully phased in	7.00%	7.00%
CET1 capital, required to be well-capitalized	$ 270,277	$ 258,785
CET1 ratio, required to be well capitalized	6.50%	6.50%
Tier I capital	$ 563,301	$ 549,031
Tier I capital, ratio	0.136	0.138
Tier 1, capital, minimum capital required basel III fully phased in	$ 353,439	$ 338,412
Tier 1, ratio, minimum capital required basel III fully phased in	8.50%	8.50%
Tier 1, capital, required to be well-capitalized	$ 332,649	$ 318,505
Tier 1, ratio, required to be well-capitalized	0.080	0.080
Total capital	$ 584,415	$ 570,099
Total capital, ratio	0.141	0.143
Total capital, minimum capital required basel III fully phased in	$ 436,602	$ 418,038
Total capital, ratio, minimum capital required basel III fully phased in	10.50%	10.50%
Total capital, required to be well-capitalized	$ 415,811	$ 398,131
Total capital, ratio, required to be well-capitalized	0.100	0.100
Tier 1 Leverage Capital, Average Assets	$ 563,301	$ 549,031
Tier I Leverage Ratio, Average Assets	0.087	0.089
Tier 1 Leverage Capital, minimum capital required basel III fully phased in	$ 258,477	$ 245,587
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	$ 323,096	$ 306,984
Tier 1 Leverage Capital, Average Assets, Well Capitalized Ratio	0.050	0.050