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Borrowings - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 16, 2022
Jun. 30, 2015
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Jun. 30, 2017
Nov. 30, 2014
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 2,600,000,000          
Long-term line of credit     0          
Collateralized borrowings availability at discount window     3,100,000,000 $ 3,100,000,000        
Collateralized borrowings availability at discount window, amount outstanding     0          
Repayments of senior debt     168,778,000 $ 5,000,000 $ 81,496,000      
Federal Home Loan Bank advances                
Debt Instrument [Line Items]                
Unused borrowing capacity     6,000,000,000.0          
debt instrument total borrowing capacity     11,100,000,000          
Senior Notes | 3.60% Senior Notes                
Debt Instrument [Line Items]                
Repayments of senior debt $ 65,000,000              
Senior Notes | 3.25% Senior Notes                
Debt Instrument [Line Items]                
Repayments of senior debt     $ 5,000,000          
Subordinated debt                
Debt Instrument [Line Items]                
Effective interest rate (as a percent)             4.69%  
Subordinated borrowings fixed rate (as a percent)   4.50%            
Subordinated debt | November 2024 Subordinated Debt                
Debt Instrument [Line Items]                
Stated interest rate (as a percent)               4.50%
Effective interest rate (as a percent)               4.87%
Subordinated debt | 3.25% Notes due 2030                
Debt Instrument [Line Items]                
Stated interest rate (as a percent)           3.25%    
Debt instrument, face amount           $ 200,000,000.0    
Effective interest rate (as a percent)           3.35%    
Subordinated debt | 3.75% Notes due 2035                
Debt Instrument [Line Items]                
Stated interest rate (as a percent)           3.75%    
Debt instrument, face amount           $ 175,000,000.0    
Effective interest rate (as a percent)           3.85%