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Availability of Funds from Subsidiaries and Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2011
Availability of Funds from Subsidiaries and Capital    
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares outstanding (in shares) 175,000  
Total capital (to risk weighted assets), Actual amount $ 2,331.9 $ 1,963.0
Total capital (to risk weighted assets), Adequately Capitalized amount 1,490.2 1,224.4
Total capital (to risk weighted assets), Well Capitalized amount 1,862.7 1,530.5
Tier 1 capital (to risk weighted assets), Actual amount 1,753.3 1,570.1
Tier 1 capital (to risk weighted assets), Adequately Capitalized amount 745.1 612.2
Tier 1 capital (to risk weighted assets), Well Capitalized amount 1,117.6 918.3
Tier 1 capital (to average assets), Actual amount 1,753.3 1,570.1
Tier 1 capital (to average assets), Adequately Capitalized amount 1,063.4 927.5
Total capital (to risk weighted assets), Actual ratio 12.52% 12.83%
Total capital (to risk weighted assets), Adequately Capitalized ratio 8.00% 8.00%
Total capital (to risk weighted assets), Well Capitalized ratio 10.00% 10.00%
Tier 1 capital (to risk weighted assets), Actual ratio 9.41% 10.26%
Tier 1 capital (to risk weighted assets), Adequately Capitalized ratio 4.00% 4.00%
Tier 1 capital (to risk weighted assets), Well Capitalized ratio 6.00% 6.00%
Tier 1 capital (to average assets), Actual ratio 6.60% 6.77%
Tier 1 capital (to average assets), Adequately Capitalized ratio 4.00% 4.00%
City National Bank:
   
Availability of Funds from Subsidiaries and Capital    
Number of prior years' net profits considered by the bank for the payment of dividend without prior regulatory consent 2  
Total capital (to risk weighted assets), Actual amount 2,388.5 2,228.3
Total capital (to risk weighted assets), Adequately Capitalized amount 1,478.2 1,214.0
Total capital (to risk weighted assets), Well Capitalized amount 1,847.8 1,517.6
Tier 1 capital (to risk weighted assets), Actual amount 1,825.5 1,856.3
Tier 1 capital (to risk weighted assets), Adequately Capitalized amount 739.1 607.0
Tier 1 capital (to risk weighted assets), Well Capitalized amount 1,108.7 910.5
Tier 1 capital (to average assets), Actual amount 1,825.5 1,856.3
Tier 1 capital (to average assets), Adequately Capitalized amount 1,055.6 920.1
Tier 1 capital (to average assets), Well Capitalized amount $ 1,319.5 $ 1,150.1
Total capital (to risk weighted assets), Actual ratio 12.93% 14.68%
Total capital (to risk weighted assets), Adequately Capitalized ratio 8.00% 8.00%
Total capital (to risk weighted assets), Well Capitalized ratio 10.00% 10.00%
Tier 1 capital (to risk weighted assets), Actual ratio 9.88% 12.23%
Tier 1 capital (to risk weighted assets), Adequately Capitalized ratio 4.00% 4.00%
Tier 1 capital (to risk weighted assets), Well Capitalized ratio 6.00% 6.00%
Tier 1 capital (to average assets), Actual ratio 6.92% 8.07%
Tier 1 capital (to average assets), Adequately Capitalized ratio 4.00% 4.00%
Tier 1 capital (to average assets), Well Capitalized ratio 5.00% 5.00%