CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities
Net income	$ 59,462	$ 225,877
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (reversal of) credit losses	5,451	(33,829)
Depreciation, amortization and accretion, net	14,171	10,531
Deferred income taxes	2,585	2,380
Other, net	7,296	10,077
Net change in securities purchased under agreements to resell	(21,667)	(122,319)
Net change in trading securities	54,725	11,772
Net change in broker-dealer and clearing organization receivables	893,304	(190,385)
Net change in other assets	(1,432)	(45,972)
Net change in broker-dealer and clearing organization payables	(629,481)	44,751
Net change in other liabilities	(40,489)	(105,218)
Net change in securities sold, not yet purchased	39,382	53,161
Proceeds from sale of mortgage servicing rights asset	1,876	84,633
Change in valuation of mortgage servicing rights asset	(18,064)	(15,273)
Net gains from sales of loans	(208,437)	(466,705)
Loans originated for sale	(8,206,551)	(13,539,646)
Proceeds from loans sold	8,793,501	13,750,233
Net cash provided by (used in) operating activities	745,632	(325,932)
Investing Activities
Proceeds from maturities and principal reductions of securities held to maturity	39,631	22,887
Proceeds from sales, maturities and principal reductions of securities available for sale	190,943	385,411
Purchases of securities held to maturity	(6,254)
Purchases of securities available for sale	(470,617)	(764,283)
Purchases of equity securities	(30)
Net change in loans held for investment	(316,887)	249,069
Purchases of premises and equipment and other assets	(4,559)	(16,696)
Proceeds from sales of premises and equipment and other real estate owned	1,803	3,263
Net cash paid to Federal Home Loan Bank and Federal Reserve Bank stock	(144)	(72)
Net cash used in investing activities	(566,114)	(120,421)
Financing Activities
Net change in deposits	(810,292)	517,962
Net change in short-term borrowings	(37,200)	220,024
Proceeds from notes payable	412,421	488,341
Payments on notes payable and junior subordinated debentures	(410,832)	(473,891)
Payments to repurchase common stock	(442,336)	(49,471)
Dividends paid on common stock	(23,767)	(19,754)
Net cash distributed to noncontrolling interest	(2,661)	(7,086)
Other, net	(5,363)	(2,586)
Net cash provided by (used in) financing activities	(1,320,030)	673,539
Net change in cash, cash equivalents and restricted cash	(1,140,512)	227,186
Cash, cash equivalents and restricted cash, beginning of period	3,045,263	1,353,303
Cash, cash equivalents and restricted cash, end of period	1,904,751	1,580,489
Supplemental Disclosures of Cash Flow Information
Cash paid for interest	42,273	69,479
Cash paid for income taxes, net of refunds	6,840	55,498
Supplemental Schedule of Non-Cash Activities
Conversion of loans to other real estate owned	179	1,805
Additions to mortgage servicing rights	18,510	$ 50,115
Carrying amount of AFS securities transferred to HTM, net of $70,435 unrealized loss	$ 686,840