Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
OPERATING ACTIVITIES:
Net income		$ 120,553	$ 120,026
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		11,456	(9,858)
Provision for depreciation and amortization		11,565	11,811
Amortization of investment security premiums, net		7,654	4,932
Investment securities (gains) losses, net (A)	[1]	306	(7,163)
Net (gains) losses on sales of loans held for sale		(137)	(1,302)
Originations of loans held for sale		(9,931)	(57,580)
Proceeds from sales of loans held for sale		8,850	57,789
Net (increase) decrease in trading debt securities, excluding unsettled transactions		11,548	9,798
Purchase of interest rate floor		(25,900)	0
Stock-based compensation		4,373	4,218
(Increase) decrease in interest receivable		(1,005)	(7,972)
Increase (decrease) in interest payable		10,025	273
Increase (decrease) in income taxes payable		26,970	28,657
Other changes, net		(60,270)	(29,115)
Net cash provided by operating activities		116,057	124,514
INVESTING ACTIVITIES:
Distributions received from equity-method investment		1,434	400
Cash proceeds from sales of investment securities	[1]	840,435	1,745
Proceeds from maturities/pay downs of investment securities (A)	[1]	474,220	805,355
Purchases of investment securities (A)	[1]	(168,584)	(1,812,434)
Net (increase) decrease in loans		(239,230)	(287,328)
Securities purchased under agreements to resell		0	(200,000)
Purchases of premises and equipment		(20,044)	(15,597)
Sales of premises and equipment		6	175
Net cash provided by (used in) investing activities		888,237	(1,507,684)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(2,137,278)	(208,358)
Net increase (decrease) in certificates of deposit		584,382	(303,277)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		(57,175)	(705,506)
Net increase (decrease) in other borrowings		1,498,104	(3,503)
Purchases of treasury stock		(36,245)	(55,855)
Issuance of stock under equity compensation plans		0	448
Cash dividends paid on common stock		(33,759)	(32,143)
Net cash used in financing activities		(181,971)	(1,308,194)
Increase (decrease) in cash, cash equivalents and restricted cash		822,323	(2,691,364)
Cash, cash equivalents and restricted cash at beginning of year		897,801	4,296,954
Cash, cash equivalents and restricted cash at March 31		1,720,124	1,605,590
Supplemental Cash Flow Information:
Income tax payments, net		3,857	1,640
Interest paid on deposits and borrowings		47,209	2,723
Loans transferred to foreclosed real estate		$ 72	$ 25

[1] Available for sale debt securities, equity securities, and other securities.