Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Related Parties - Additional Information (Details) - USD ($)	1 Months Ended			12 Months Ended
	Apr. 30, 2017	Feb. 28, 2017	Apr. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Subordinated Borrowings				$ 6,799,000	$ 16,550,000
Subordinated Debt [Member]
Related Party Transaction [Line Items]
Extinguishment of Debt, Amount	$ 3,751,000	$ 6,000,000	$ 6,000,000
Other Assets [Member]
Related Party Transaction [Line Items]
Due from Related Parties, Noncurrent				22,309,000	17,862,000
Investment Management [Member] \| Private Equity Fund [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties				$ (101,000)	10,170,000	$ 8,876,000
Investment Banking [Member] \| Director [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties					$ 13,312,000