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Restrictions On Cash Due From Banks	12 Months Ended
Restrictions On Cash Due From Banks	Dec. 31, 2017
Restricted Cash and Investments [Abstract]
Restrictions On Cash Due From Banks	RESTRICTIONS ON CASH AND DUE FROM BANKS City National is required to maintain an average reserve balance with the Federal Reserve Bank of Richmond to compensate for services provided by the Federal Reserve and to meet statutory required reserves for demand deposits. The average amounts of the reserve balances for the years ended December 31, 2017 and 2016 were approximately $37.8 million and $33.3 million, respectively.