CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net income (loss)	$ 472,568	$ 552,132
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (reversal of) credit losses	143,607	49,669
Depreciation, amortization, and accretion, net	63,554	53,352
Deferred income tax expense (benefit)	22,827	(11,800)
Originations of loans held for sale	(468,407)	(3,062,036)
Proceeds from sales and payments on loans held for sale	798,317	3,113,210
Gain on sales of loans held for sale, net	(7,781)	(10,837)
(Increase) decrease in other assets	(250,016)	(54,211)
Increase (decrease) in other liabilities	170,688	(41,711)
Investment securities (gains) losses, net	(1,030)	0
Share-based compensation expense	24,851	22,385
Loss on sales of loans	50,064	0
Other	(2,832)	677
Net cash provided by (used in) operating activities	1,016,410	610,830
Investing Activities
Net cash received (paid) for business combination and divestiture	8,359	0
Proceeds from maturities and principal collections of investment securities available for sale	714,090	1,725,243
Proceeds from sales of investment securities available for sale	82,595	0
Purchases of investment securities available for sale	(709,932)	(2,037,176)
Net proceeds from sales of loans	1,642,232	63,159
Purchases of loans	(10,623)	(514,475)
Net (increase) decrease in loans	(1,750,770)	(2,821,297)
Net (purchases) redemptions of Federal Home Loan Bank stock	95,185	(145,075)
Net (purchases) redemptions of Federal Reserve Bank stock	(15,679)	4,037
Net proceeds from settlement (purchases) of bank-owned life insurance policies	3,360	4,499
Net increase in premises, equipment and software	(20,557)	(21,487)
Other	9,367	48,784
Net cash provided by (used in) investing activities	47,627	(3,693,788)
Financing Activities
Net increase (decrease) in deposits	1,339,392	(1,709,371)
Net increase (decrease) in federal funds purchased and securities sold under repurchase agreements	(48,318)	(23,923)
Net increase (decrease) in other short-term borrowings	(601,022)	614,332
Repayments and redemption of long-term debt	(4,621,226)	(400,000)
Proceeds from long-term debt, net	3,220,912	3,647,693
Dividends paid to common shareholders	(160,503)	(146,709)
Dividends paid to preferred shareholders	(26,204)	(24,872)
Repurchases of common stock	0	(12,987)
Issuances, net of taxes paid, under equity compensation plans	(7,217)	(3,254)
Net cash provided by (used in) financing activities	(904,186)	1,940,909
Increase (decrease) in cash and cash equivalents including restricted cash	159,851	(1,142,049)
Cash, cash equivalents, and restricted cash, at beginning of period	1,977,780	3,009,853
Cash, cash equivalents, and restricted cash at end of period	2,137,631	1,867,804
Supplemental Disclosures:
Income taxes paid	60,082	139,556
Interest paid	780,407	111,441
Non-cash Activities
Settlement of acquired debt	$ 31,109	$ 0