Business Combinations (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) business
Business Acquisition [Line Items]
Business acquisition, number completed during period	0
Pending Acquisition [Member]
Business Acquisition [Line Items]
Business acquisition, number completed during period	1
Assets Under Management [Member]
Business Acquisition [Line Items]
Business Acquisitions, Investment Advisor | $	$ 10,000