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Benefit Plan (Tables)
9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Components Of Net Periodic Benefit Expense
The following table shows the components of net periodic pension benefit income:

Three Months Ended
September 30,
Nine Months Ended
September 30,
Affected Line Item in the Consolidated
Condensed Statements of Income
(In thousands)2023202220232022
Service cost$1,559 $2,437 $4,677 $7,311 Employee benefits
Interest cost1,631 1,426 4,893 4,278 Other components of net
periodic pension benefit income
Expected return on plan assets(3,536)(4,449)(10,608)(13,347)Other components of net
periodic pension benefit income
Recognized prior service cost (credit)12 (4)36 (12)Other components of net
periodic pension benefit income
Net periodic pension benefit income$(334)$(590)$(1,002)$(1,770)

Park has entered into Supplemental Executive Retirement Plan Agreements (the “SERP Agreements”) with certain key officers of Park and its subsidiaries which provide defined pension benefits in excess of limits imposed by federal tax law. The expense
for the Corporation related to the SERP Agreements for the three months and the nine months ended September 30, 2023 and 2022 was as follows:

Three Months Ended
September 30,
Nine Months Ended
September 30,
Affected Line Item in the Consolidated
Condensed Statements of Income
(In thousands)2023202220232022
Service cost$234 $212 $702 $637 Employee benefits
Interest cost176 183 527 549 Miscellaneous expense
Total SERP expense$410 $395 $1,229 $1,186