Parent Company Only Condensed Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets
Securities	$ 9,280,000	$ 10,720,000
Other assets	506,167	601,160
Total assets	29,717,951	28,618,492
Liabilities
Short-term borrowings	3,889	1,423,798
Long-term debt	735,968	706,051
Other liabilities	473,438	407,162
Total liabilities	26,937,197	26,072,062
Total liabilities and shareholders' equity	29,717,951	28,618,492
Parent Company
Assets
Cash	147,439	295,314
Securities	49,213	61,250
Other assets	87,621	71,885
Investment in City National Bank	2,583,000	2,407,500
Investment in non-bank subsidiaries	202,841	194,973
Total assets	3,070,114	3,030,922
Liabilities
Short-term borrowings		206,581
Long-term debt	304,618	302,765
Other liabilities	24,510	16,258
Total liabilities	329,128	525,604
Total shareholders' equity	2,740,986	2,505,318
Total liabilities and shareholders' equity	$ 3,070,114	$ 3,030,922