Business Segments - Schedule Of Operating Results And Other Key Financial Measures For The Individual Operating Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information
Net interest income before provision for credit losses	$ 2,278,716	$ 2,312,254	$ 2,045,881
Noninterest income	335,218	295,264	298,666
Total revenue (loss) before provision for credit losses	2,613,934	2,607,518	2,344,547
Provision for (reversal of) credit losses	174,000	125,000	73,500
Compensation and employee benefits	550,734	508,538	477,635
Other noninterest expense	407,339	514,210	381,758
Total noninterest expense	958,073	1,022,748	859,393
INCOME BEFORE INCOME TAXES	1,481,861	1,459,770	1,411,654
Segment net income	1,165,586	1,161,161	1,128,083
Loans	52,368,780	49,545,136	45,319,458
Deposits	59,673,039	54,962,731	54,299,579
Segment assets	75,976,475	69,612,884	64,112,150
Consumer and Business Banking
Segment Reporting Information
Net interest income before provision for credit losses	1,152,033	1,225,954	1,061,238
Noninterest income	108,773	103,890	113,722
Total revenue (loss) before provision for credit losses	1,260,806	1,329,844	1,174,960
Provision for (reversal of) credit losses	8,691	21,454	25,983
Compensation and employee benefits	217,612	203,387	195,394
Other noninterest expense	234,494	262,086	196,581
Total noninterest expense	452,106	465,473	391,975
INCOME BEFORE INCOME TAXES	800,009	842,917	757,002
Segment net income	563,218	594,965	537,754
Loans	18,966,662	17,739,984	15,534,259
Deposits	30,815,912	28,174,781	27,276,151
Segment assets	20,084,814	19,165,172	17,183,425
Commercial Banking
Segment Reporting Information
Net interest income before provision for credit losses	1,125,931	1,116,013	988,158
Noninterest income	197,780	168,502	174,365
Total revenue (loss) before provision for credit losses	1,323,711	1,284,515	1,162,523
Provision for (reversal of) credit losses	166,953	100,391	48,248
Compensation and employee benefits	234,240	217,663	211,355
Other noninterest expense	161,969	158,949	102,018
Total noninterest expense	396,209	376,612	313,373
INCOME BEFORE INCOME TAXES	760,549	807,512	800,902
Segment net income	535,652	570,153	569,982
Loans	32,996,221	31,365,547	29,321,701
Deposits	25,820,956	23,304,066	23,252,073
Segment assets	35,646,939	35,020,106	32,770,772
Treasury and Other
Segment Reporting Information
Net interest income before provision for credit losses	752	(29,713)	(3,515)
Noninterest income	28,665	22,872	10,579
Total revenue (loss) before provision for credit losses	29,417	(6,841)	7,064
Provision for (reversal of) credit losses	(1,644)	3,155	(731)
Compensation and employee benefits	98,882	87,488	70,886
Other noninterest expense	10,876	93,175	83,159
Total noninterest expense	109,758	180,663	154,045
INCOME BEFORE INCOME TAXES	(78,697)	(190,659)	(146,250)
Segment net income	66,716	(3,957)	20,347
Loans	405,897	439,605	463,498
Deposits	3,036,171	3,483,884	3,771,355
Segment assets	$ 20,244,722	$ 15,427,606	$ 14,157,953