v3.26.3
Segment Reporting - Net Income (GAAP) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Segment
Sep. 30, 2025
USD ($)
Segment Reporting        
Number of reportable operating segments | Segment     1  
Net Income (GAAP)        
Interest income $ 864,856 $ 881,682 $ 2,519,944 $ 2,530,752
Interest expense 273,338 281,985 790,872 808,560
Net interest income (a) 591,518 599,697 1,729,072 1,722,192
Provision for credit losses 20,345 5,085 47,072 113,152
Net interest income after provision for credit losses 571,173 594,612 1,682,000 1,609,040
Total noninterest income        
Securities losses, net       (228,811)
Gain on sale-leaseback, net of transaction costs       229,279
Total noninterest income 93,911 99,086 290,735 271,991
Total noninterest expense        
Salaries and employee benefits 217,237 199,148 628,267 595,121
Occupancy expense 44,136 40,874 130,316 117,874
Information services expense 29,968 28,988 88,808 90,505
Professional fees 5,898 4,994 16,227 14,361
Amortization of intangibles 20,628 23,426 62,973 71,305
FDIC assessment and other regulatory charges 10,911 8,374 31,921 31,101
Merger and branch consolidation related expense   20,889   113,274
Total noninterest expense 374,763 372,342 1,092,036 1,156,229
Income before income tax provision 290,321 321,356 880,699 724,802
Income tax provision 66,523 74,715 201,059 173,857
Net income (GAAP) 223,798 246,641 679,640 550,945
General Banking Unit        
Net Income (GAAP)        
Interest income 864,856 881,682 2,519,944 2,530,752
Interest expense 273,338 281,985 790,872 808,560
Net interest income (a) 591,518 599,697 1,729,072 1,722,192
Provision for credit losses 20,345 5,085 47,072 113,152
Net interest income after provision for credit losses 571,173 594,612 1,682,000 1,609,040
Total noninterest income        
Securities losses, net       (228,811)
Gain on sale-leaseback, net of transaction costs       229,279
Other operating noninterest income 93,911 99,086 290,735 271,523
Total noninterest income 93,911 99,086 290,735 271,991
Total noninterest expense        
Employee salaries 148,312 136,630 434,924 408,253
Employee commissions 17,782 15,656 53,115 41,210
Employee incentives 39,523 32,612 103,299 95,001
Other salaries and benefits 35,429 34,957 108,871 108,275
Deferred loan costs (23,809) (20,707) (71,942) (57,618)
Salaries and employee benefits 217,237 199,148 628,267 595,121
Occupancy expense 44,136 40,874 130,316 117,874
Information services expense 29,968 28,988 88,808 90,505
Professional fees 5,898 4,994 16,227 14,361
Amortization of intangibles 20,628 23,426 62,973 71,305
Business development and staff related 10,877 8,907 32,877 22,600
FDIC assessment and other regulatory charges 10,911 8,374 31,921 31,101
Merger and branch consolidation related expense   20,889   113,274
Other operating expense 35,108 36,742 100,647 100,088
Total noninterest expense 374,763 372,342 1,092,036 1,156,229
Income before income tax provision 290,321 321,356 880,699 724,802
Income tax provision 66,523 74,715 201,059 173,857
Net income (GAAP) 223,798 246,641 679,640 550,945
Net Interest Margin, Non-Tax Equivalent ("Non-TE") (GAAP)        
Average interest earning assets (b) $ 62,217,447 $ 58,727,110 $ 61,191,513 $ 57,982,690
Net interest margin, non-TE ((a)/(b)) (GAAP) 3.77% 4.05% 3.78% 3.97%