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Segment Reporting - Net Income (GAAP) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Number of reportable operating segments 1    
Net Income (GAAP)      
Interest income $ 2,141,362 $ 1,944,406 $ 1,397,025
Interest expense 725,908 491,798 61,354
Net interest income (a) 1,415,454 1,452,608 1,335,671
Provision for credit losses 15,975 114,082 81,855
Net interest income after provision for credit losses 1,399,479 1,338,526 1,253,816
Total noninterest income 302,262 286,906 309,247
Total noninterest expense      
Salaries and employee benefits 606,869 583,398 554,704
Occupancy expense 90,103 88,695 89,501
Information services expense 92,193 84,472 79,701
Professional Fees 16,404 18,547 15,331
Amortization of intangibles 22,395 27,558 33,205
FDIC assessment and regulatory charges 31,152 33,070 23,033
Merger, branch consolidation, severance related and other expense 20,133 13,162 30,888
FDIC special assessment 3,852 25,691  
Total noninterest expense 1,001,493 994,580 929,701
Income before income tax provision 700,248 630,852 633,362
Income tax provision 165,465 136,544 137,313
Net income (GAAP) 534,783 494,308 496,049
General Banking Unit      
Net Income (GAAP)      
Interest income 2,141,362 1,944,406 1,397,025
Interest expense 725,908 491,798 61,354
Net interest income (a) 1,415,454 1,452,608 1,335,671
Provision for credit losses 15,975 114,082 81,855
Net interest income after provision for credit losses 1,399,479 1,338,526 1,253,816
Total noninterest income 302,262 286,906 309,247
Total noninterest expense      
Employee salaries 423,769 404,327 376,945
Employee Commissions 46,176 53,175 70,776
Employee incentives 97,951 90,369 101,641
Other salaries and benefits 100,166 89,520 93,573
Deferred loan costs (61,193) (53,993) (88,231)
Salaries and employee benefits 606,869 583,398 554,704
Occupancy expense 90,103 88,695 89,501
Information services expense 92,193 84,472 79,701
Professional Fees 16,404 18,547 15,331
Amortization of intangibles 22,395 27,558 33,205
Business development and staff related 23,782 25,055 19,015
FDIC assessment and regulatory charges 31,152 33,070 23,033
Merger, branch consolidation, severance related and other expense 20,133 13,162 30,888
FDIC special assessment 3,852 25,691  
Other operating expense 94,610 94,932 84,323
Total noninterest expense 1,001,493 994,580 929,701
Income before income tax provision 700,248 630,852 633,362
Income tax provision 165,465 136,544 137,313
Net income (GAAP) 534,783 494,308 496,049
Net Interest Margin, Non-Tax Equivalent ("Non-TE") (GAAP)      
Average interest earning assets (b) $ 41,299,577 $ 40,098,398 $ 39,881,909
Net interest margin, non-TE ((a)/(b)) (GAAP) 3.43% 3.62% 3.35%