Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income
Loans and leases, including fees	$ 2,061,570	$ 1,455,612	$ 5,909,035	$ 3,572,954
Investment securities
Fully taxable	199,187	135,766	578,656	294,290
Exempt from federal taxes	16,425	16,555	49,541	34,388
Deposits at banks	362,840	172,956	943,686	272,009
Other	1,377	624	3,091	1,270
Total interest income	2,641,399	1,781,513	7,484,009	4,174,911
Interest expense
Savings and interest-checking deposits	494,219	68,690	1,139,649	103,344
Time deposits	201,541	1,124	441,075	3,748
Short-term borrowings	69,481	2,670	223,253	6,090
Long-term borrowings	100,770	30,338	287,251	67,147
Total interest expense	866,011	102,822	2,091,228	180,329
Net interest income	1,775,388	1,678,691	5,392,781	3,994,582
Provision for credit losses	150,000	115,000	420,000	427,000
Net interest income after provision for credit losses	1,625,388	1,563,691	4,972,781	3,567,582
Other income
Brokerage services income	26,988	21,086	76,155	65,414
Trading account and other non-hedging derivative gains	9,379	5,081	37,808	12,743
Gain (loss) on bank investment securities	(235)	(1,108)	353	(1,913)
Other revenues from operations	142,519	153,189	664,034	436,943
Total other income	559,581	563,079	1,949,885	1,675,066
Other expense
Salaries and employee benefits	726,940	736,354	2,272,547	2,090,075
Equipment and net occupancy	130,842	127,117	386,435	337,584
Outside data processing and software	110,691	95,068	322,909	268,607
FDIC assessments	29,364	28,105	87,054	66,266
Advertising and marketing	22,898	21,398	82,314	58,057
Printing, postage and supplies	13,964	14,768	42,346	40,488
Amortization of core deposit and other intangible assets	14,946	18,384	47,099	38,024
Other costs of operations	227,893	238,059	688,623	743,047
Total other expense	1,277,538	1,279,253	3,929,327	3,642,148
Income before taxes	907,431	847,517	2,993,339	1,600,500
Income taxes	217,490	200,921	734,740	374,208
Net income	689,941	646,596	2,258,599	1,226,292
Net income available to common shareholders
Basic	663,763	620,549	2,179,802	1,152,400
Diluted	$ 663,766	$ 620,554	$ 2,179,812	$ 1,152,406
Net income per common share
Basic	$ 4	$ 3.55	$ 13.09	$ 7.18
Diluted	$ 3.98	$ 3.53	$ 13.05	$ 7.14
Average common shares outstanding
Basic	165,909	174,609	166,488	160,474
Diluted	166,570	175,682	167,093	161,295
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 104,478	$ 83,041	$ 296,575	$ 275,115
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	121,360	115,213	353,603	340,890
Trust Income [Member]
Other income
Revenue from contract with customer	$ 155,092	$ 186,577	$ 521,357	$ 545,874