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Employee Benefit Plans
 9 Months Ended
Sep. 30, 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 September 30, 2025 and 2024 was $3.5 million and $3.7 million, respectively. For the nine months ended September 30, 2025 and 2024, 401(k) Retirement Plan expense was $10.5 million and $10.3 million, respectively.

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

Three months ended September 30Nine months ended September 30
 2025202420252024
 (dollars in thousands)
Interest cost$768 $790 $2,303 $2,369 
Expected return on plan assets(978)(976)(2,934)(2,927)
Net periodic pension cost$(210)$(186)$(631)$(558)

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

Three months ended September 30Nine months ended September 30
 2025202420252024
 (dollars in thousands)
Interest cost$9 $10 $26 $29 
Net accretion and deferral(136)(135)(407)(406)
Net periodic postretirement benefit$(127)$(125)$(381)$(377)
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.