Cash and Cash Equivalents and Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2021

Cash And Cash Equivalents [Abstract]

Summary of Reconciliation of Cash and Cash Equivalents with Restricted or Segregated Cash

The following table provides a reconciliation of cash and cash equivalents together with restricted or segregated cash as reported within the Consolidated Statements of Financial Condition to the sum of the same such amounts shown in the Consolidated Statements of Cash Flows:

	Statement of Financial Condition Location	December 31, 2021		December 31, 2020		December 31, 2019
		(In thousands)
Cash and cash equivalents	Cash and cash equivalents	$	506,735	$	460,858	$	270,124
Cash segregated for regulatory purposes	Cash segregated under federal regulations		50,159		50,059		—
Deposits with clearing organizations and broker-dealers	Receivables from broker-dealers, clearing organizations and customers		68,565		97,043		—
Other deposits	Prepaid expenses and other assets		108		90		4,129
Total		$	625,567	$	608,050	$	274,253