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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Related Parties Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Subordinated Borrowings		$ 0	$ 6,799
Other Assets [Member]
Related Party Transaction [Line Items]
Due from Related Parties, Noncurrent		$ 16,359	22,309
Executive Officer [Member]
Related Party Transaction [Line Items]
Subordinated Borrowings			$ 6,700
Investment Banking [Member] \| Director [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 13,312