Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows From Operating Activities:
Net income	$ 485,534	$ 563,468
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,250	33,496
Amortization of loans and advances to financial advisors and other employees	98,624	83,850
Amortization of premium on investment portfolio	9,795	12,969
Provision for credit losses and allowance for loans and advances to financial advisors and other employees	27,478	(15,564)
Amortization of intangible assets	14,966	13,216
Deferred income taxes	(15,690)	(42,492)
Stock-based compensation	103,281	85,283
Losses on sale of investments	14,933	1,302
Other, net	4,883	39,809
Receivables:
Brokerage clients	(79,193)	(185,327)
Brokers, dealers, and clearing organizations	32,800	61,063
Securities purchased under agreements to resell	38,026	(380,605)
Financial instruments owned, including those pledged	159,318	(505,358)
Loans originated as held for sale	(513,195)	(1,594,937)
Proceeds from mortgages held for sale	503,284	1,954,135
Loans and advances to financial advisors and other employees	(105,431)	(94,958)
Other assets	25,510	(76,967)
Increase/(decrease) in operating liabilities, net of liabilities assumed:
Brokerage clients	(90,781)	253,308
Brokers, dealers, and clearing organizations	4,172	28,900
Drafts	(52,164)	(31,848)
Financial instruments sold, but not yet purchased	(118,436)	283,050
Other liabilities and accrued expenses	(213,725)	84,942
Net cash provided by operating activities	370,239	570,735
Cash Flows From Investing Activities:
Principal paydowns, calls, and maturities of available-for-sale securities	287,460	448,780
Calls and principal paydowns of held-to-maturity securities	113,454	1,307,342
Sale or maturity of investments	12,761	17,581
Increase in loans held for investment, net	(4,075,687)	(2,480,035)
Payments for:
Purchase of fixed assets	(44,924)	(173,183)
Purchase of available-for-sale securities	(102,917)	(807,088)
Purchase of held-to-maturity securities	(754,306)	(2,223,971)
Purchase of investments	(13,450)	(20,515)
Acquisitions, net of cash received	(11,021)	(315)
Net cash used in investing activities	(4,588,630)	(3,931,404)
Cash Flows From Financing Activities:
Proceeds from Federal Home Loan Bank advances, net	0	52,000
Payment of contingent consideration	(11,303)	(16,798)
Increase/(decrease) in securities sold under agreements to repurchase	(127,769)	4,496
Increase in bank deposits, net	3,910,271	3,002,377
Increase in securities loaned	19,521	38,441
Tax payments related to shares withheld for stock-based compensation plans	(87,434)	(70,202)
Proceeds from preferred stock issuance, net	0	290,721
Redemption of preferred stock	0	(150,000)
Repurchase of common stock	(30,666)	(84,723)
Cash dividends on preferred stock	(27,961)	(26,267)
Cash dividends paid to common stock and equity-award holders	(100,538)	(47,307)
Net cash provided by financing activities	3,544,121	2,992,738
Effect of exchange rate changes on cash	(28,975)	(3,907)
Decrease in cash, cash equivalents, and cash segregated for regulatory purposes	(703,245)	(371,838)
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	1,446,412	2,080,368
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds	162,681	227,641
Cash paid for interest	103,100	47,070
Noncash financing activities:
Unit grants, net of forfeitures	$ 188,359	$ 142,771