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, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information
Net interest income before provision for (reversal of) credit losses	$ 2,552,629	$ 2,278,716	$ 2,312,254
Noninterest income	379,227	335,218	293,112
Total revenue before provision for (reversal of) credit losses	2,931,856	2,613,934	2,605,366
Provision for (reversal of) credit losses	160,000	174,000	125,000
Compensation and employee benefits	618,753	550,734	508,538
Other noninterest expense	427,643	407,339	512,058
Total noninterest expense	1,046,396	958,073	1,020,596
INCOME BEFORE INCOME TAXES	1,725,460	1,481,861	1,459,770
Segment net income (loss)	1,325,188	1,165,586	1,161,161
Loans	54,624,959	52,368,780	49,545,136
Deposits	64,849,361	59,673,039	54,962,731
Segment assets	80,434,997	75,976,475	69,612,884
Consumer and Business Banking
Segment Reporting Information
Net interest income before provision for (reversal of) credit losses	1,079,288	1,152,033	1,225,954
Noninterest income	120,779	108,773	103,210
Total revenue before provision for (reversal of) credit losses	1,200,067	1,260,806	1,329,164
Provision for (reversal of) credit losses	26,044	8,691	21,454
Compensation and employee benefits	240,500	217,612	203,387
Other noninterest expense	229,833	234,494	261,406
Total noninterest expense	470,333	452,106	464,793
INCOME BEFORE INCOME TAXES	703,690	800,009	842,917
Segment net income (loss)	502,687	563,218	594,965
Loans	20,313,671	18,966,662	17,739,984
Deposits	33,384,458	30,815,912	28,174,781
Segment assets	21,384,121	20,084,814	19,165,172
Commercial Banking
Segment Reporting Information
Net interest income before provision for (reversal of) credit losses	1,028,314	1,125,931	1,116,013
Noninterest income	218,177	197,780	168,502
Total revenue before provision for (reversal of) credit losses	1,246,491	1,323,711	1,284,515
Provision for (reversal of) credit losses	152,085	166,953	100,391
Compensation and employee benefits	246,303	234,240	217,663
Other noninterest expense	157,616	161,969	158,949
Total noninterest expense	403,919	396,209	376,612
INCOME BEFORE INCOME TAXES	690,487	760,549	807,512
Segment net income (loss)	493,508	535,652	570,153
Loans	34,000,936	32,996,221	31,365,547
Deposits	27,137,950	25,820,956	23,304,066
Segment assets	37,393,886	35,646,939	35,020,106
Treasury and Other
Segment Reporting Information
Net interest income before provision for (reversal of) credit losses	445,027	752	(29,713)
Noninterest income	40,271	28,665	21,400
Total revenue before provision for (reversal of) credit losses	485,298	29,417	(8,313)
Provision for (reversal of) credit losses	(18,129)	(1,644)	3,155
Compensation and employee benefits	131,950	98,882	87,488
Other noninterest expense	40,194	10,876	91,703
Total noninterest expense	172,144	109,758	179,191
INCOME BEFORE INCOME TAXES	331,283	(78,697)	(190,659)
Segment net income (loss)	328,993	66,716	(3,957)
Loans	310,352	405,897	439,605
Deposits	4,326,953	3,036,171	3,483,884
Segment assets	$ 21,656,990	$ 20,244,722	$ 15,427,606