Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities:
Net income	$ 334,365	$ 371,092
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	23,773	21,680
Amortization of loans and advances to financial advisors and other employees	65,539	55,281
Amortization of premium on investment portfolio	6,920	8,907
Provision for credit losses and allowance for loans and advances to financial advisors and other employees	21,025	(14,904)
Amortization of intangible assets	10,578	8,759
Deferred income taxes	351	20,758
Stock-based compensation	75,193	58,571
Losses on sale of investments	14,468	553
Other, net	340	37,985
Receivables:
Brokerage clients	(191,268)	(395,262)
Brokers, dealers, and clearing organizations	196,515	(137,575)
Securities purchased under agreements to resell	(28,185)	(405,000)
Financial instruments owned, including those pledged	(114,028)	(550,985)
Loans originated as held for sale	(413,357)	(1,185,385)
Proceeds from mortgages held for sale	345,525	1,532,485
Loans and advances to financial advisors and other employees	(83,150)	(52,624)
Other assets	(4,205)	(140,630)
Increase/(decrease) in operating liabilities, net of liabilities assumed:
Brokerage clients	(105,866)	(64,290)
Brokers, dealers, and clearing organizations	14,806	93,099
Drafts	(41,648)	(32,849)
Financial instruments sold, but not yet purchased	55,752	410,932
Other liabilities and accrued expenses	(383,920)	(76,587)
Net cash used in operating activities	(200,477)	(435,989)
Cash Flows From Investing Activities:
Principal paydowns and maturities of available-for-sale securities	145,373	239,846
Calls and principal paydowns of held-to-maturity securities	108,789	1,002,163
Sale or maturity of investments	10,092	17,581
Increase in loans held for investment, net	(2,375,896)	(1,975,039)
Payments for:
Purchase of fixed assets	(26,722)	(25,835)
Purchase of available-for-sale securities	(102,917)	(619,446)
Purchase of held-to-maturity securities	(642,356)	(1,558,941)
Purchase of investments	(5,465)	(9,055)
Acquisitions, net of cash received	0	(315)
Net cash used in investing activities	(2,889,102)	(2,929,041)
Cash Flows From Financing Activities:
Payment of contingent consideration	(5,974)	(11,313)
Increase/(decrease) in securities sold under agreements to repurchase	(35,322)	216,291
Increase in bank deposits, net	2,728,952	2,212,303
Increase in securities loaned	81,103	154,112
Tax payments related to shares withheld for stock-based compensation plans	(85,606)	(68,008)
Repurchase of common stock	(30,666)	(41,007)
Cash dividends on preferred stock	(18,641)	(16,578)
Cash dividends paid to common stock and equity-award holders	(68,516)	(31,613)
Net cash provided by financing activities	2,565,330	2,414,187
Effect of exchange rate changes on cash	(17,570)	4,745
Decrease in cash, cash equivalents, and cash segregated for regulatory purposes	(541,819)	(946,098)
Cash, cash equivalents, and cash segregated for regulatory purposes at beginning of period	2,149,657	2,452,206
Cash, cash equivalents, and cash segregated for regulatory purposes at end of period	1,607,838	1,506,108
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds	111,840	169,409
Cash paid for interest	38,009	31,634
Noncash financing activities:
Unit grants, net of forfeitures	$ 184,188	$ 135,393