Nature of Operations and Summary of Significant Accounting Policies (Details)	3 Months Ended
Mar. 31, 2022 USD ($) Item
Financing Receivable, Credit Quality Indicator [Line Items]
Cash and cash equivalents held at the Federal Reserve Bank of Kansas City	$ 182,000,000
Required reserve	$ 0
Number of subsidiaries \| Item	3

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033

Name:	us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant