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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
The Corporation's 401(k) Retirement Plan is a defined contribution plan under which eligible employees may defer a portion of their pre-tax covered compensation on an annual basis, with employer matches of up to 5% of employee compensation. 401(k) Retirement Plan expense for the three months ended March 31, 2025 and 2024 was $2.6 million and $3.2 million, respectively.

The net periodic pension cost for the Pension Plan consisted of the following components:

Three months ended March 31
 20252024
 (dollars in thousands)
Interest cost$768 $790 
Expected return on plan assets(978)(976)
Net periodic pension cost$(210)$(186)

The components of the net benefit for the Postretirement Plan consisted of the following components:

Three months ended March 31
 20252024
 (dollars in thousands)
Interest cost$9 $10 
Net accretion and deferral(136)(136)
Net periodic benefit$(127)$(126)
In connection with the Merger, the Corporation assumed the obligations of Prudential Bancorp under a multiemployer defined benefit pension plan that had previously been closed to new Prudential Bancorp participants.