Parent Company Only Condensed Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Securities	$ 10,720,000	$ 8,100,000
Other assets	601,160	577,541
Total assets	28,618,492	23,666,291
Liabilities
Short-term borrowings	1,423,798	50,000
Long-term debt	706,051	697,778
Other liabilities	407,162	316,640
Total liabilities	26,072,062	21,476,799
Total liabilities and shareholders' equity	28,618,492	23,666,291
Parent Company
Assets
Cash	295,314	58,671
Securities	61,250	76,723
Other assets	71,885	81,339
Investment in City National Bank	2,407,500	2,260,564
Investment in non-bank subsidiaries	194,973	198,486
Total assets	3,030,922	2,675,783
Liabilities
Short-term borrowings	206,581
Long-term debt	302,765	518,307
Other liabilities	16,258	12,627
Total liabilities	525,604	530,934
Total shareholders' equity	2,505,318	2,144,849
Total liabilities and shareholders' equity	$ 3,030,922	$ 2,675,783