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Employee Benefit Plans
3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Employee Benefit Plans EMPLOYEE BENEFIT PLANS
BancShares sponsors non-contributory defined benefit pension plans for its qualifying employees. The service cost component of net periodic benefit cost is included in salaries and wages while all other non-service cost components are included in other noninterest expense.

The components of net periodic benefit cost are as follows:
dollars in millionsThree Months Ended March 31,
20232022
Service cost$$
Interest cost15 11 
Expected return on assets(21)(22)
Amortization of prior service cost— — 
Amortization of net actuarial loss— 
Net periodic benefit$(4)$(5)