Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
OPERATING ACTIVITIES:
Net income		$ 240,179	$ 299,478
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		(2,696)	(51,887)
Provision for depreciation and amortization		23,638	22,525
Amortization of investment security premiums, net		5,946	41,270
Investment securities gains, net (A)	[1]	(8,192)	(26,657)
Net gains on sales of loans held for sale		(1,944)	(13,677)
Originations of loans held for sale		(93,439)	(325,714)
Proceeds from sales of loans held for sale		96,282	356,559
Net decrease in trading debt securities, excluding unsettled transactions		870	1,287
Stock-based compensation		8,409	7,723
(Increase) decrease in interest receivable		(11,739)	6,688
Increase (decrease) in interest payable		247	(2,809)
Increase (decrease) in income taxes payable		(1,855)	19,095
Other changes, net		30,464	(6,632)
Net cash provided by operating activities		286,170	327,249
INVESTING ACTIVITIES:
Distributions received from equity-method investment		400	0
Cash proceeds from sales of investment securities	[1]	3,712	10,060
Proceeds from maturities/pay downs of investment securities (A)	[1]	1,462,151	1,789,405
Purchases of investment securities (A)	[1]	(1,894,221)	(2,707,024)
Net (increase) decrease in loans		(518,899)	678,554
Securities purchased under agreements to resell		(200,000)	(450,000)
Repayments of securities purchased under agreements to resell		375,000	0
Purchases of premises and equipment		(28,985)	(21,944)
Sales of premises and equipment		1,401	4,786
Net cash used in investing activities		(799,441)	(696,163)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(1,302,692)	685,582
Net decrease in certificates of deposit		(437,030)	(98,436)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		(788,671)	219,845
Net increase (decrease) in other borrowings		(6,535)	1,392
Purchases of treasury stock		(113,205)	(39,887)
Issuance of stock under equity compensation plans		448	(15)
Cash dividends paid on common stock		(64,078)	(61,559)
Net cash provided by (used in) financing activities		(2,711,763)	706,922
Increase (decrease) in cash, cash equivalents and restricted cash		(3,225,034)	338,008
Cash, cash equivalents and restricted cash at beginning of year		4,296,954	2,208,328
Cash, cash equivalents and restricted cash at June 30		1,071,920	2,546,336
Supplemental Cash Flow Information:
Income tax payments, net		62,588	55,440
Interest paid on deposits and borrowings		8,518	9,909
Loans transferred to foreclosed real estate		$ 25	$ 172

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