Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
OPERATING ACTIVITIES:
Net income		$ 115,452	$ 120,553
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		4,787	11,456
Provision for depreciation and amortization		13,269	11,565
Amortization of investment security premiums, net		3,905	7,654
Investment securities (gains) losses, net (A)	[1]	259	306
Net (gains) losses on sales of loans held for sale		(328)	(137)
Originations of loans held for sale		(15,914)	(9,931)
Proceeds from sales of loans held for sale		18,007	8,850
Net (increase) decrease in trading debt securities, excluding unsettled transactions		(40,529)	11,548
Purchase of interest rate floor		0	(25,900)
Stock-based compensation		4,266	4,373
(Increase) decrease in interest receivable		561	(1,005)
Increase (decrease) in interest payable		(286)	10,025
Increase (decrease) in income taxes payable		28,750	26,970
Other changes, net		3,277	(60,270)
Net cash provided by (used in) operating activities		135,476	116,057
INVESTING ACTIVITIES:
Distributions received from equity-method investment		0	1,434
Proceeds from sales of investment securities (A)	[1]	10,250	840,435
Proceeds from maturities/pay downs of investment securities (A)	[1]	571,764	474,220
Purchases of investment securities (A)	[1]	(155,475)	(168,584)
Net (increase) decrease in loans		(102,295)	(239,230)
Securities purchased under agreements to resell		(100,000)	0
Repayments of securities purchased under agreements to resell		325,000	0
Purchases of premises and equipment		(10,998)	(20,044)
Sales of premises and equipment		2,671	6
Net cash provided by (used in) investing activities		540,917	888,237
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(571,329)	(2,137,278)
Net increase (decrease) in certificates of deposit		(412,170)	584,382
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		(403,239)	(57,175)
Net increase (decrease) in other borrowings		955	1,498,104
Purchases of treasury stock		(42,028)	(36,245)
Cash dividends paid on common stock		(35,140)	(33,759)
Net cash provided by (used in) financing activities		(1,462,951)	(181,971)
Increase (decrease) in cash, cash equivalents and restricted cash		(786,558)	822,323
Cash, cash equivalents and restricted cash at beginning of year		2,687,283	897,801
Cash, cash equivalents and restricted cash at March 31		1,900,725	1,720,124
Supplemental Cash Flow Information:
Income tax payments, net		1,029	3,857
Interest paid on deposits and borrowings		110,008	47,209
Loans transferred to foreclosed real estate		$ 57	$ 72

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