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Employee Benefit Plans (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
numberOfAgreement
policy
Dec. 31, 2023
USD ($)
Dec. 31, 2014
numberOfAgreement
Defined Benefit Plan Disclosure [Line Items]      
Employers matching contribution vesting percentage (in percent) 100.00%    
Matching contribution (in percent) 4.00%    
Matching contributions $ 312,000,000 $ 282,000,000  
Salary continuation contracts, service period 20 years    
Salary continuation plan accrued liability $ 4,400,000 $ 4,300,000  
Discounted cash flow rate (in percent) 4.92% 5.30%  
Salaries and benefits expense $ 306,000,000 $ 314,000,000  
Number of officers | numberOfAgreement 4    
Number of policies | policy 4    
COLI policy premium payment term 7 years    
Life insurance premium expense $ 0 0  
Unrecognized net periodic benefit costs 147,000,000 130,000,000  
Cash surrender value of life insurance - net 20,692,000 21,954,000  
Income (loss) on bank owned life insurance policies $ 551,000,000 $ 557,000,000  
Salary Continuation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Additional compensation benefits term 15 years    
Number of salary continuation agreements | numberOfAgreement 12   8
Salary Continuation Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Benefit plan vesting period 12 years    
Salary Continuation Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Benefit plan vesting period 32 years