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Defined Benefit Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following table presents components of net periodic benefit cost and other amounts recognized in other comprehensive income (loss), on a pre-tax basis:
(Dollars in thousands)Qualified Pension PlanNon-Qualified Retirement Plans
Three MonthsSix Months Three MonthsSix Months
Periods ended June 30, 20242023202420232024202320242023
Net Periodic Benefit Cost:
Service cost (1)
$125 $350 $250 $701 $— $39 $— $78 
Interest cost (2)
833 887 1,666 1,771 163 177 325 353 
Expected return on plan assets (2)
(1,028)(1,148)(2,056)(2,295)— — — — 
Recognized net actuarial loss (2)
— — — — 30 60 61 119 
Net periodic benefit cost($70)$89 ($140)$177 $193 $276 $386 $550 
(1)Included in salaries and employee benefits expense in the Unaudited Consolidated Statements of Income. Service cost for 2024 represents administrative expenses related to the termination of the qualified pension plan.
(2)Included in other expenses in the Unaudited Consolidated Statements of Income.
Schedule of Assumptions Used for Net Periodic Benefit Cost
The following table presents the measurement date and weighted-average assumptions used to determine net periodic benefit cost:
Qualified Pension PlanNon-Qualified Retirement Plans
For the six months ended June 30, 2024202320242023
Measurement dateDec 31, 2023Dec 31, 2022Dec 31, 2023Dec 31, 2022
Equivalent single discount rate for benefit obligations4.51%5.54%5.15%5.50%
Equivalent single discount rate for service costN/A5.60N/A5.61
Equivalent single discount rate for interest cost4.515.435.115.40
Expected long-term return on plan assets4.755.25N/AN/A
Rate of compensation increase0.505.00N/A5.00