CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income	$ 552,132	$ 560,065
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (reversal of) credit losses	49,669	(51,041)
Depreciation, amortization, and accretion, net	53,352	97,856
Deferred income tax expense (benefit)	(11,800)	36,213
Originations of loans held for sale	(3,062,036)	(2,872,628)
Proceeds from sales and payments on loans held for sale	3,113,210	3,117,269
Gain on sales of loans held for sale, net	(10,837)	(36,930)
(Increase) decrease in other assets	(54,211)	(1,234)
Increase (decrease) in other liabilities	(41,711)	(28,741)
Investment securities (gains) losses, net	0	1,028
Share-based compensation expense	22,385	21,485
Other	677	0
Net cash provided by (used in) operating activities	610,830	843,342
Investing Activities
Proceeds from maturities and principal collections of investment securities available for sale	1,725,243	2,279,073
Proceeds from sales of investment securities available for sale	0	223,977
Purchases of investment securities available for sale	(2,037,176)	(5,447,210)
Proceeds from sales of loans	63,159	105,753
Purchases of loans	(514,475)	(1,494,924)
Net (increase) decrease in loans	(2,821,297)	1,238,658
Net (purchases) redemptions of Federal Home Loan Bank stock	(145,075)	(1,200)
Net (purchases) redemptions of Federal Reserve Bank stock	4,037	(1,210)
Net proceeds from settlement (purchases) of bank-owned life insurance policies	4,499	7,094
Net increase in premises, equipment and software	(21,487)	(19,996)
Other	48,784	8,852
Net cash provided by (used in) investing activities	(3,693,788)	(3,101,133)
Financing Activities
Net increase (decrease) in deposits	(1,709,371)	996,848
Net increase (decrease) in federal funds purchased and securities sold under repurchase agreements	(23,923)	34,626
Net increase (decrease) in other short-term borrowings	614,332	(7,717)
Repayments and redemption of long-term debt	(400,000)	0
Proceeds from issuance of long-term debt	3,647,693	0
Dividends paid to common shareholders	(146,709)	(146,578)
Dividends paid to preferred shareholders	(24,872)	(24,872)
Repurchases of common stock	(12,987)	(167,142)
Issuances, net of taxes paid, under equity compensation plans	(3,254)	8,233
Other	0	(1,104)
Net cash provided by (used in) financing activities	1,940,909	692,294
Increase (decrease) in cash and cash equivalents including restricted cash	(1,142,049)	(1,565,497)
Cash, cash equivalents, and restricted cash, at beginning of period	3,009,853	4,252,917
Cash, cash equivalents, and restricted cash at end of period	1,867,804	2,687,420
Supplemental Disclosures:
Income taxes paid	139,556	150,722
Interest paid	111,441	108,889
Non-cash Activities
Securities purchased during the period but settled after period-end	0	196,289
Premises and equipment transferred to other assets held for sale	19,367	22,725
Loans foreclosed and transferred to other real estate	0	964
Loans transferred (from) to other loans held for sale at fair value	$ (13,855)	$ (1,462)