Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income
Loans and leases, including fees	$ 1,997,809	$ 1,246,742	$ 3,847,465	$ 2,117,342
Investment securities
Fully taxable	197,882	119,392	379,469	158,524
Exempt from federal taxes	16,505	17,783	33,116	17,833
Deposits at banks	302,429	80,773	580,846	99,053
Other	1,000	452	1,714	646
Total interest income	2,515,625	1,465,142	4,842,610	2,393,398
Interest expense
Savings and interest-checking deposits	368,362	27,907	645,430	34,654
Time deposits	150,337	1,227	239,534	2,624
Short-term borrowings	95,996	3,419	153,772	3,420
Long-term borrowings	101,801	20,872	186,481	36,809
Total interest expense	716,496	53,425	1,225,217	77,507
Net interest income	1,799,129	1,411,717	3,617,393	2,315,891
Provision for credit losses	150,000	302,000	270,000	312,000
Net interest income after provision for credit losses	1,649,129	1,109,717	3,347,393	2,003,891
Other income
Brokerage services income	25,126	24,138	49,167	44,328
Trading account and other non-hedging derivative gains	16,754	2,293	28,429	7,662
Gain (loss) on bank investment securities	1,004	(62)	588	(805)
Other revenues from operations	362,015	147,551	521,515	283,754
Total other income	803,171	571,100	1,390,304	1,111,987
Other expense
Salaries and employee benefits	737,665	776,201	1,545,607	1,353,721
Equipment and net occupancy	128,689	124,655	255,593	210,467
Outside data processing and software	106,438	93,820	212,218	173,539
FDIC assessments	27,932	22,585	57,690	38,161
Advertising and marketing	28,353	20,635	59,416	36,659
Printing, postage and supplies	14,199	15,570	28,382	25,720
Amortization of core deposit and other intangible assets	14,945	18,384	32,153	19,640
Other costs of operations	234,338	331,304	460,730	504,988
Total other expense	1,292,559	1,403,154	2,651,789	2,362,895
Income before taxes	1,159,741	277,663	2,085,908	752,983
Income taxes	292,707	60,141	517,250	173,287
Net income	867,034	217,522	1,568,658	579,696
Net income available to common shareholders
Basic	840,520	192,236	1,516,046	531,914
Diluted	$ 840,524	$ 192,236	$ 1,516,052	$ 531,916
Net income per common share
Basic	$ 5.07	$ 1.08	$ 9.09	$ 3.47
Diluted	$ 5.05	$ 1.08	$ 9.06	$ 3.45
Average common shares outstanding
Basic	165,842	177,367	166,782	153,290
Diluted	166,320	178,277	167,359	153,981
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 107,112	$ 82,926	$ 192,097	$ 192,074
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	118,697	124,170	232,243	225,677
Trust Income [Member]
Other income
Revenue from contract with customer	$ 172,463	$ 190,084	$ 366,265	$ 359,297