CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities
Net income (loss)	$ 376,103	$ 349,088
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for (reversal of) credit losses	71,035	24,088
Depreciation, amortization, and accretion, net	41,854	36,991
Deferred income tax expense (benefit)	19,194	(3,227)
Originations of loans held for sale	(311,902)	(2,095,264)
Proceeds from sales and payments on loans held for sale	603,486	1,926,118
Gain on sales of loans held for sale, net	(5,739)	(7,277)
(Increase) decrease in other assets	(155,005)	(107,698)
Increase (decrease) in other liabilities	59,529	72,987
Investment securities (gains) losses, net	(1,030)	0
Share-based compensation expense	16,951	14,511
Other	(377)	677
Net cash provided by (used in) operating activities	714,099	210,994
Investing Activities
Net cash received in business combination, net of cash paid	8,009	0
Proceeds from maturities and principal collections of investment securities available for sale	449,581	1,226,967
Proceeds from sales of investment securities available for sale	82,595	0
Purchases of investment securities available for sale	(440,014)	(1,269,468)
Proceeds from sales of loans	84,132	47,130
Purchases of loans	(10,623)	(361,567)
Net (increase) decrease in loans	(1,183,701)	(1,594,366)
Net (purchases) redemptions of Federal Home Loan Bank stock	49,935	(45,700)
Net (purchases) redemptions of Federal Reserve Bank stock	(15,564)	(536)
Net proceeds from settlement (purchases) of bank-owned life insurance policies	3,360	3,106
Net increase in premises, equipment and software	(12,703)	(11,260)
Other	6,976	33,984
Net cash provided by (used in) investing activities	(978,017)	(1,971,710)
Financing Activities
Net increase (decrease) in deposits	1,217,129	(389,758)
Net increase (decrease) in federal funds purchased and securities sold under repurchase agreements	(63,204)	81,109
Net increase (decrease) in other short-term borrowings	(601,923)	254,818
Repayments and redemption of long-term debt	(3,304,600)	(400,000)
Proceeds from long-term debt, net	3,220,912	1,000,000
Dividends paid to common shareholders	(104,967)	(97,293)
Dividends paid to preferred shareholders	(16,581)	(16,581)
Repurchases of common stock	0	(12,987)
Issuances, net of taxes paid, under equity compensation plans	(6,477)	(3,385)
Net cash provided by (used in) financing activities	340,289	415,923
Increase (decrease) in cash and cash equivalents including restricted cash	76,371	(1,344,793)
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	2,054,151	1,665,060
Supplemental Disclosures:
Income taxes paid	57,988	88,090
Interest paid	478,101	52,330
Non-cash Activities
Loans transferred (from) to other loans held for sale	427,903	(9,386)
Settlement of acquired debt	$ 31,109	$ 0