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Regulatory Requirements And Capital Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Parent Company    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cash balance $ 20,621 $ 59,031
City National    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Dividends Available Without Regulatory Approval $ 88,800