v3.25.2
Segments - Operating Segment Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Segment
Jun. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Operating Statistics [Line Items]                
Reportable segments | Segment     3          
Goodwill weighting assigned     100.00%          
Cash, cash equivalents, and investment securities $ 21,368.0   $ 21,368.0     $ 19,191.0    
Loans HFS 3,022.0   3,022.0     2,286.0    
Loans HFI, net of deferred fees and costs 55,939.0   55,939.0     53,676.0    
Less: allowance for credit losses (394.7) $ (351.8) (394.7) $ (351.8) $ (388.6) (373.8) $ (340.3) $ (336.7)
Net loans HFI 55,544.0   55,544.0     53,302.0    
Goodwill and intangible assets, net 653.0   653.0     659.0    
Other assets 6,138.0   6,138.0     5,496.0    
Total assets 86,725.0   86,725.0     80,934.0    
Total deposits 71,107.0   71,107.0     66,341.0    
Borrowings and qualifying debt 6,730.0   6,730.0     6,472.0    
Other liabilities 1,481.0   1,481.0     1,414.0    
Total liabilities 79,318.0   79,318.0     74,227.0    
Total equity 7,406.8 6,334.2 7,406.8 6,334.2 $ 7,214.5 6,707.5 $ 6,172.5 $ 6,078.4
Allocated equity: 7,114.0   7,114.0     6,707.0    
Total liabilities and equity 86,725.0   86,725.0     80,934.0    
Excess funds provided (used) 0.0   0.0     0.0    
Interest income 1,154.4 1,147.5 2,250.0 2,202.5        
Interest expense 456.8 490.9 901.8 947.0        
Funds transfer pricing 0.0 0.0 0.0 0.0        
Net interest income 697.6 656.6 1,348.2 1,255.5        
Provision for credit losses 39.9 37.1 71.1 52.3        
Net interest income (expense) after provision for credit losses 657.7 619.5 1,277.1 1,203.2        
Non-interest income 148.3 115.2 275.7 245.1        
Salaries and employee benefits 179.9 153.0 362.3 307.9        
Other non-interest expense 334.8 333.8 652.8 660.7        
Income (loss) before provision for income taxes 291.3 247.9 537.7 479.7        
Income tax expense (benefit) 53.5 54.3 100.8 108.7        
Net income 237.8 193.6 $ 436.9 371.0        
Minimum                
Operating Statistics [Line Items]                
Equity capital weighting assigned     0.00%          
Maximum                
Operating Statistics [Line Items]                
Equity capital weighting assigned     25.00%          
Operating Segments | Commercial Segment                
Operating Statistics [Line Items]                
Cash, cash equivalents, and investment securities 16.0   $ 16.0     14.0    
Loans HFS 0.0   0.0     0.0    
Loans HFI, net of deferred fees and costs 33,207.0   33,207.0     31,544.0    
Less: allowance for credit losses (332.0)   (332.0)     (320.0)    
Net loans HFI 32,875.0   32,875.0     31,224.0    
Goodwill and intangible assets, net 290.0   290.0     291.0    
Other assets 318.0   318.0     367.0    
Total assets 33,499.0   33,499.0     31,896.0    
Total deposits 26,307.0   26,307.0     25,487.0    
Borrowings and qualifying debt 0.0   0.0     15.0    
Other liabilities 76.0   76.0     72.0    
Total liabilities 26,383.0   26,383.0     25,574.0    
Total equity 3,503.0   3,503.0          
Allocated equity:           2,727.0    
Total liabilities and equity 29,886.0   29,886.0     28,301.0    
Excess funds provided (used) (3,613.0)   (3,613.0)     (3,595.0)    
Interest income 612.9 625.5 1,204.4 1,232.7        
Interest expense 153.5 174.8 303.4 343.1        
Funds transfer pricing (138.3) (158.6) (270.1) (308.9)        
Net interest income 321.1 292.1 630.9 580.7        
Provision for credit losses 35.0 36.1 66.2 51.4        
Net interest income (expense) after provision for credit losses 286.1 256.0 564.7 529.3        
Non-interest income 38.3 23.1 75.2 49.1        
Salaries and employee benefits 35.4 39.8 79.6 74.6        
Other non-interest expense 134.4 110.4 259.2 231.0        
Income (loss) before provision for income taxes 154.6 128.9 301.1 272.8        
Income tax expense (benefit) 28.1 28.1 50.5 61.9        
Net income 126.5 100.8 250.6 210.9        
Operating Segments | Consumer Related Segment                
Operating Statistics [Line Items]                
Cash, cash equivalents, and investment securities 53.0   53.0     0.0    
Loans HFS 3,022.0   3,022.0     2,286.0    
Loans HFI, net of deferred fees and costs 22,732.0   22,732.0     22,132.0    
Less: allowance for credit losses (63.0)   (63.0)     (54.0)    
Net loans HFI 22,669.0   22,669.0     22,078.0    
Goodwill and intangible assets, net 363.0   363.0     368.0    
Other assets 1,978.0   1,978.0     1,923.0    
Total assets 28,085.0   28,085.0     26,655.0    
Total deposits 38,546.0   38,546.0     33,767.0    
Borrowings and qualifying debt 44.0   44.0     37.0    
Other liabilities 564.0   564.0     476.0    
Total liabilities 39,154.0   39,154.0     34,280.0    
Total equity 2,352.0   2,352.0          
Allocated equity:           1,899.0    
Total liabilities and equity 41,506.0   41,506.0     36,179.0    
Excess funds provided (used) 13,421.0   13,421.0     9,524.0    
Interest income 303.3 258.5 588.5 510.9        
Interest expense 156.9 155.3 312.9 289.4        
Funds transfer pricing 286.0 236.0 556.2 410.7        
Net interest income 432.4 339.2 831.8 632.2        
Provision for credit losses 4.8 1.0 9.9 0.6        
Net interest income (expense) after provision for credit losses 427.6 338.2 821.9 631.6        
Non-interest income 86.0 90.0 165.5 185.7        
Salaries and employee benefits 39.1 31.5 82.1 69.0        
Other non-interest expense 291.2 299.9 557.9 558.6        
Income (loss) before provision for income taxes 183.3 96.8 347.4 189.7        
Income tax expense (benefit) 34.3 21.5 59.5 43.3        
Net income 149.0 75.3 287.9 146.4        
Corporate & Other | Corporate And Other Segment                
Operating Statistics [Line Items]                
Cash, cash equivalents, and investment securities 21,299.0   21,299.0     19,177.0    
Loans HFS 0.0   0.0     0.0    
Loans HFI, net of deferred fees and costs 0.0   0.0     0.0    
Less: allowance for credit losses 0.0   0.0     0.0    
Net loans HFI 0.0   0.0     0.0    
Goodwill and intangible assets, net 0.0   0.0     0.0    
Other assets 3,842.0   3,842.0     3,206.0    
Total assets 25,141.0   25,141.0     22,383.0    
Total deposits 6,254.0   6,254.0     7,087.0    
Borrowings and qualifying debt 6,686.0   6,686.0     6,420.0    
Other liabilities 841.0   841.0     866.0    
Total liabilities 13,781.0   13,781.0     14,373.0    
Total equity 1,552.0   1,552.0          
Allocated equity:           2,081.0    
Total liabilities and equity 15,333.0   15,333.0     16,454.0    
Excess funds provided (used) (9,808.0)   (9,808.0)     $ (5,929.0)    
Interest income 238.2 263.5 457.1 458.9        
Interest expense 146.4 160.8 285.5 314.5        
Funds transfer pricing (147.7) (77.4) (286.1) (101.8)        
Net interest income (55.9) 25.3 (114.5) 42.6        
Provision for credit losses 0.1 0.0 (5.0) 0.3        
Net interest income (expense) after provision for credit losses (56.0) 25.3 (109.5) 42.3        
Non-interest income 24.0 2.1 35.0 10.3        
Salaries and employee benefits 105.4 81.7 200.6 164.3        
Other non-interest expense (90.8) (76.5) (164.3) (128.9)        
Income (loss) before provision for income taxes (46.6) 22.2 (110.8) 17.2        
Income tax expense (benefit) (8.9) 4.7 (9.2) 3.5        
Net income $ (37.7) $ 17.5 $ (101.6) $ 13.7