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Borrowings - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 16, 2022
Sep. 30, 2022
Jun. 30, 2015
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jul. 01, 2022
Mar. 31, 2021
Jun. 30, 2016
Nov. 30, 2014
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 2,600,000,000            
Collateralized borrowings availability at discount window       1,300,000,000 $ 1,300,000,000          
Repayments of senior debt       5,000,000 $ 81,496,000 $ 710,633,000        
Payments For Repurchase Of Trust Preferred Debt   $ 17,200,000                
Federal Home Loan Bank advances                    
Debt Instrument [Line Items]                    
Unused borrowing capacity       4,900,000,000            
debt instrument total borrowing capacity       8,200,000,000            
Senior Notes | 3.60% Senior Notes                    
Debt Instrument [Line Items]                    
Repayments of senior debt $ 65,000,000                  
Stated interest rate (as a percent) 3.60%                  
Senior Notes | 3.25% Senior Notes                    
Debt Instrument [Line Items]                    
Repayments of senior debt       $ 5,000,000            
Subordinated debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                 $ 150,000,000  
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                   $ 100,000,000
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    
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    
Effective interest rate (as a percent)               3.85%    
Prudential                    
Debt Instrument [Line Items]                    
Assumed borrowings             $ 284,000,000