Regulatory Requirements - Narrative (Details)	Mar. 31, 2022	Dec. 31, 2021
Brokers and Dealers [Abstract]
Standardized (as a percent)	0	0

Countercyclical capital buffer percentage as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Name:	us-gaap_BankingRegulationCountercyclicalCapitalBuffer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant