Restrictions as to Dividends and Limitations on Indebtedness Textual (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Minimum consolidated net worth	$ 50
Ratio of combined earnings and fixed earnings to fixed charges required to maintain availability of credit line	1.25

Minimum amount of net capital required to be maintained by broker-dealer and its subsidiary, calculated under Aggregate Indebtedness Standard.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	srt_MinimumNetCapitalRequired1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant