Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
OPERATING ACTIVITIES:
Net income		$ 366,366	$ 425,232
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		12,594	(59,272)
Provision for depreciation and amortization		35,350	33,554
Amortization of investment security premiums, net		8,565	51,822
Investment securities gains, net (A)	[1]	(11,602)	(39,765)
Net gains on sales of loans held for sale		(2,607)	(18,849)
Originations of loans held for sale		(114,765)	(442,853)
Proceeds from sales of loans held for sale		116,421	485,231
Net (increase) decrease in trading debt securities, excluding unsettled transactions		14,080	(9,093)
Purchase of interest rate floor		(16,849)	0
Stock-based compensation		12,641	11,588
(Increase) decrease in interest receivable		(21,959)	11,449
Increase (decrease) in interest payable		1,097	(3,168)
Increase in income taxes payable		168	19,831
Other changes, net		70,285	20,418
Net cash provided by operating activities		469,785	486,125
INVESTING ACTIVITIES:
Distributions received from equity-method investment		400	13,540
Cash proceeds from sales of investment securities	[1]	55,690	10,060
Proceeds from maturities/pay downs of investment securities (A)	[1]	2,079,939	2,571,116
Purchases of investment securities (A)	[1]	(1,951,694)	(4,457,716)
Net (increase) decrease in loans		(736,474)	1,166,769
Securities purchased under agreements to resell		(200,000)	(900,000)
Repayments of securities purchased under agreements to resell		550,000	0
Purchases of premises and equipment		(46,636)	(37,385)
Sales of premises and equipment		1,613	4,786
Net cash used in investing activities		(247,162)	(1,628,830)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(2,078,327)	1,428,561
Net decrease in certificates of deposit		(454,376)	(228,916)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		(708,377)	155,370
Net increase (decrease) in other borrowings		(10,729)	3,204
Purchases of treasury stock		(163,321)	(80,052)
Issuance of stock under equity compensation plans		447	(16)
Cash dividends paid on common stock		(95,818)	(92,204)
Net cash provided by (used in) financing activities		(3,510,501)	1,185,947
Increase (decrease) in cash, cash equivalents and restricted cash		(3,287,878)	43,242
Cash, cash equivalents and restricted cash at beginning of year		4,296,954	2,208,328
Cash, cash equivalents and restricted cash at September 30		1,009,076	2,251,570
Supplemental Cash Flow Information:
Income tax payments, net		92,646	87,989
Interest paid on deposits and borrowings		23,961	13,213
Loans transferred to foreclosed real estate		$ 457	$ 172

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