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Regulatory Requirements And Capital Ratios (Schedule Of Capital Amounts And Ratios) (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Parent Company    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
CET1 capital $ 627,579 $ 598,068
CET1 ratio 0.157 0.162
CET1 capital, minimum capital required basel III fully phased in $ 279,768 $ 257,965
CET1 ratio, minimum capital required basel III fully phased in 7.00% 7.00%
CET1 capital, required to be well-capitalized $ 259,875 $ 239,538
CET1 ratio, required to be well capitalized 6.50% 6.50%
Tier I capital $ 627,579 $ 598,068
Tier I capital, ratio 0.157 0.162
Tier 1, capital, minimum capital required basel III fully phased in $ 339,718 $ 313,243
Tier 1, ratio, minimum capital required basel III fully phased in 8.50% 8.50%
Tier 1, capital, required to be well-capitalized $ 319,735 $ 294,817
Tier 1, ratio, required to be well-capitalized 0.080 0.080
Total capital $ 648,646 $ 612,654
Total capital, ratio 0.162 0.166
Total capital, minimum capital required basel III fully phased in $ 419,652 $ 386,947
Total capital, ratio, minimum capital required basel III fully phased in 10.50% 10.50%
Total capital, required to be well-capitalized $ 399,669 $ 368,521
Total capital, ratio, required to be well-capitalized 0.100 0.100
Tier 1 Leverage Capital, Average Assets $ 627,579 $ 598,068
Tier I Leverage Ratio, Average Assets 0.102 0.100
Tier 1 Leverage Capital, minimum capital required basel III fully phased in $ 245,468 $ 238,954
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 $ 306,835 $ 298,692
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 $ 549,031 $ 508,586
CET1 ratio 0.138 0.139
CET1 capital, minimum capital required basel III fully phased in $ 278,692 $ 256,520
CET1 ratio, minimum capital required basel III fully phased in 7.00% 7.00%
CET1 capital, required to be well-capitalized $ 258,785 $ 238,197
CET1 ratio, required to be well capitalized 6.50% 6.50%
Tier I capital $ 549,031 $ 508,586
Tier I capital, ratio 0.138 0.139
Tier 1, capital, minimum capital required basel III fully phased in $ 338,412 $ 311,488
Tier 1, ratio, minimum capital required basel III fully phased in 8.50% 8.50%
Tier 1, capital, required to be well-capitalized $ 318,505 $ 293,166
Tier 1, ratio, required to be well-capitalized 0.080 0.080
Total capital $ 570,099 $ 523,172
Total capital, ratio 0.143 0.143
Total capital, minimum capital required basel III fully phased in $ 418,038 $ 384,780
Total capital, ratio, minimum capital required basel III fully phased in 10.50% 10.50%
Total capital, required to be well-capitalized $ 398,131 $ 366,457
Total capital, ratio, required to be well-capitalized 0.100 0.100
Tier 1 Leverage Capital, Average Assets $ 549,031 $ 508,586
Tier I Leverage Ratio, Average Assets 0.089 0.086
Tier 1 Leverage Capital, minimum capital required basel III fully phased in $ 245,587 $ 237,973
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 $ 306,984 $ 297,466
Tier 1 Leverage Capital, Average Assets, Well Capitalized Ratio 0.050 0.050