Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES:
Net income		$ 373,716	$ 366,366
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		29,572	12,594
Provision for depreciation and amortization		36,661	35,350
Amortization of investment security premiums, net		13,345	8,565
Investment securities (gains) losses, net (A)	[1]	(7,384)	(11,602)
Net (gains) losses on sales of loans held for sale		(705)	(2,607)
Originations of loans held for sale		(40,470)	(114,765)
Proceeds from sales of loans held for sale		40,775	116,421
Net (increase) decrease in trading debt securities, excluding unsettled transactions		14,354	14,080
Purchase of interest rate floor		(54,449)	(16,849)
Stock-based compensation		12,594	12,641
(Increase) decrease in interest receivable		(7,861)	(21,959)
Increase (decrease) in interest payable		41,622	1,097
Increase (decrease) in income taxes payable		(52)	168
Other changes, net		(83,973)	70,285
Net cash provided by (used in) operating activities		367,745	469,785
INVESTING ACTIVITIES:
Cash Paid in Acquisition, Net of Cash Received		(6,365)	0
Distributions received from equity-method investment		1,434	400
Proceeds from sales of investment securities (A)	[1]	1,141,949	55,690
Proceeds from maturities/pay downs of investment securities (A)	[1]	1,315,175	2,079,939
Purchases of investment securities (A)	[1]	(190,637)	(1,951,694)
Net (increase) decrease in loans		(849,375)	(736,474)
Securities purchased under agreements to resell		0	(200,000)
Repayments of securities purchased under agreements to resell		375,000	550,000
Purchases of premises and equipment		(72,563)	(46,636)
Sales of premises and equipment		3,751	1,613
Net cash provided by (used in) investing activities		1,718,369	(247,162)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(2,995,739)	(2,078,327)
Net increase (decrease) in certificates of deposit		1,980,677	(454,376)
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		(96,553)	(708,377)
Proceeds from FHLBank Borrowings, Financing Activities		2,250,000	0
Payments of FHLBank Borrowings, Financing Activities		(1,750,000)	0
Net increase (decrease) in other borrowings		(6,083)	(10,729)
Purchases of treasury stock		(56,541)	(163,321)
Cash dividends paid on common stock		(101,160)	(95,818)
Proceeds from (Payments for) Other Financing Activities		0	447
Net cash provided by (used in) financing activities		(775,399)	(3,510,501)
Increase (decrease) in cash, cash equivalents and restricted cash		1,310,715	(3,287,878)
Cash, cash equivalents and restricted cash at beginning of year		897,801	4,296,954
Cash, cash equivalents and restricted cash at September 30		2,208,516	1,009,076
Supplemental Cash Flow Information:
Income tax payments, net		97,018	92,646
Interest paid on deposits and borrowings		227,352	23,961
Loans transferred to foreclosed real estate		$ 133	$ 457

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