Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows From Operating Activities:
Net income	$ 291,891	$ 334,365
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,891	23,773
Amortization of loans and advances to financial advisors and other employees	69,955	65,539
Amortization of premium on investment portfolio	5,037	6,920
Provision for credit losses and allowance for loans and advances to financial advisors and other employees	12,744	21,025
Amortization of intangible assets	9,070	10,578
Deferred income taxes	(4,789)	351
Stock-based compensation	75,878	75,193
(Gains)/losses on sale of investments	(1,363)	14,468
Other, net	3,060	340
Receivables:
Brokerage clients	29,485	(191,268)
Brokers, dealers, and clearing organizations	113,658	196,515
Securities purchased under agreements to resell	(194,420)	(28,185)
Financial instruments owned, including those pledged	(413,146)	(114,028)
Loans originated as held for sale	(484,273)	(413,357)
Proceeds from mortgages held for sale	500,067	345,525
Loans and advances to financial advisors and other employees	(81,128)	(83,150)
Other assets	(52,896)	(54,412)
Increase/(decrease) in operating liabilities, net of liabilities assumed:
Brokerage clients	109,875	(105,866)
Brokers, dealers, and clearing organizations	51,856	14,806
Drafts	(16,064)	(41,648)
Financial instruments sold, but not yet purchased	210,670	55,752
Other liabilities and accrued expenses	(270,368)	(372,052)
Net cash provided by operating activities	(6,310)	(238,816)
Cash Flows From Investing Activities:
Principal paydowns, calls, and maturities of available-for-sale securities	79,339	145,373
Calls and principal paydowns of held-to-maturity securities	38,800	108,789
Sale or maturity of investments	1,794	10,092
Decrease/(increase) in loans held for investment, net	30,655	(2,375,896)
Payments for:
Purchase of fixed assets	(26,749)	(26,722)
Purchase of available-for-sale securities	(18,444)	(102,917)
Purchase of held-to-maturity securities	0	(642,356)
Purchase of investments	(11,554)	(546)
Acquisitions, net of cash received	(60,285)	0
Net cash provided by/(used in) investing activities	33,556	(2,889,102)
Cash Flows From Financing Activities:
Payment of contingent consideration	(919)	(5,974)
Increase/(decrease) in securities sold under agreements to repurchase	106,310	(35,322)
(Decrease)/increase in bank deposits, net	(112,304)	2,728,952
Increase in securities loaned	42,071	81,103
Tax payments related to shares withheld for stock-based compensation plans	(80,656)	(85,606)
Repurchase of common stock	(181,342)	(30,666)
Cash dividends on preferred stock	(18,640)	(18,641)
Cash dividends paid to common stock and equity-award holders	(85,856)	(68,516)
Net cash (used in)/provided by financing activities	(331,336)	2,565,330
Effect of exchange rate changes on cash	4,386	20,769
Decrease in cash, cash equivalents, and cash segregated for regulatory purposes	(299,704)	(541,819)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Beginning Balance	2,229,002	2,149,657
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Ending Balance	1,929,298	1,607,838
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds	95,244	111,840
Cash paid for interest	352,657	38,009
Noncash financing activities:
Unit grants, net of forfeitures	$ 168,545	$ 184,188