Acquisitions, Asset Sales, and Divestitures Asset Sales and Divestitures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill, Impairment Loss	$ 24,901	$ 9,528	$ 0
Long Lived Assets Held-for-sale, Description		The rationale for the sale was to better position the Company’s resources within the Southern California market.
Disposal Group, Liabilities, Deposits Included in Sale		$ 104,000
Gain/ (loss) on sale of affiliates or offices	(1,264)	$ 2,862	$ 0
Anchor [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sales of Business, Affiliate and Productive Assets	32,000
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	15,000
Goodwill, Impairment Loss	24,900
Disposal Group, Including Discontinued Operation, Assets	58,800
Disposal Group, Including Discontinued Operation, Liabilities	3,200
Gain (Loss) on Sale of Properties, Applicable Income Taxes	$ 11,400
Long Lived Assets Held-for-sale, Description	The rationale for the sale is to focus the Company’s resources in businesses where we can offer holistic financial advice, along with integrated wealth management, trust, and private banking capabilities. This transaction will also generate additional capital for us to reinvest in a more focused Company.
Westfield Capital Management Company LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Nature of Activities Having Continuing Cash Flows after Disposal	12.5% share in Westfield’s revenues (up to an annual maximum of $11.6 million)
Discontinued Operation, Period of Continuing Cash Flows after Disposal	1 year