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Borrowed Funds (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Jun. 30, 2011
6.75% Subordinated Notes Due September 2011
City National Bank
Dec. 31, 2010
6.75% Subordinated Notes Due September 2011
City National Bank
Jun. 30, 2010
6.75% Subordinated Notes Due September 2011
City National Bank
Jun. 30, 2011
9.00% Subordinated Notes Due July 2019
City National Bank
Dec. 31, 2010
9.00% Subordinated Notes Due July 2019
City National Bank
Jun. 30, 2010
9.00% Subordinated Notes Due July 2019
City National Bank
Jun. 30, 2011
9.00% Subordinated Notes Due August 2019
City National Bank
Dec. 31, 2010
9.00% Subordinated Notes Due August 2019
City National Bank
Jun. 30, 2010
9.00% Subordinated Notes Due August 2019
City National Bank
Jun. 30, 2011
Fixed and Floating Subordinated Notes due August 2019
City National Bank
Dec. 31, 2010
Fixed and Floating Subordinated Notes due August 2019
City National Bank
Jun. 30, 2010
Fixed and Floating Subordinated Notes due August 2019
City National Bank
Jun. 30, 2011
5.125% Senior Notes Due February 2013
City National Bank
Dec. 31, 2010
5.125% Senior Notes Due February 2013
City National Bank
Jun. 30, 2010
5.125% Senior Notes Due February 2013
City National Bank
Jun. 30, 2011
5.25% Senior Notes Due September 2020
City National Bank
Dec. 31, 2010
5.25% Senior Notes Due September 2020
City National Bank
Jun. 30, 2011
Floating Rate Securities Due November 2034
Bancorp Capital Trust I
Dec. 31, 2010
Floating Rate Securities Due November 2034
Bancorp Capital Trust I
Jun. 30, 2010
Floating Rate Securities Due November 2034
Bancorp Capital Trust I
Jun. 30, 2010
9.625% Securities Due February 2040
City National Capital Trust I
Short-term borrowings and long-term debt                                                
Fixed interest rate (as a percent)         6.75%   9.00% 9.00% 9.00%             5.125% 5.125% 5.125% 5.25% 5.25%       9.625%
Basis rate for initial period under option one LIBOR                                              
Frequency to reset interest rate                         Quarterly               Quarterly      
Interest rate cap (as a percent)                         10.00%                      
Interest rate for initial period (as a percent)             9.00%           9.00%                      
Initial interest rate period (in years)             5           5                      
Description of basis rate use for variable rate                         three-month LIBOR               three-month LIBOR      
Basis spread after initial period under option one (as a percent)             6.00%           6.00%                      
Basis spread (as a percent)                                         1.965%      
Interest rate as of reporting date (as a percent)                                         2.22%      
Basis spread after initial period under option two (as a percent)             5.00%                                  
Short-term borrowings                                                
Federal funds purchased     $ 2,700                                          
Other short-term borrowings 680 620 700                                          
Total short-term borrowings 149,771 153,444 3,400                                          
Current portion of subordinated debt       149,091 152,824                                      
Basis rate for initial period under option two             Prime                                  
Long-term Debt                                                
Long-term debt 701,829 704,971 985,974                         220,086 223,416 224,978 297,155 297,003 5,151 5,151 5,151 243,153
Long-term portion of subordinated debt           158,325 49,699 49,680 49,662 74,849 74,839 74,830 54,889 54,882 54,875                  
Securities sold under repurchase agreements     $ 175,000