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Employee Benefit Plans
 6 Months Ended
Jun. 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 June 30, 2025 and 2024 was $3.6 million and $3.4 million, respectively. For the six months ended June 30, 2025 and 2024, 401(k) Retirement Plan expense was $7.1 million and $6.6 million, respectively.

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

Three months ended June 30Six months ended June 30
 2025202420252024
 (dollars in thousands)
Interest cost$767 $789 $1,535 $1,579 
Expected return on plan assets(978)(975)(1,956)(1,951)
Net periodic pension cost$(211)$(186)$(421)$(372)

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

Three months ended June 30Six months ended June 30
 2025202420252024
 (dollars in thousands)
Interest cost$8 $9 $17 $19 
Net accretion and deferral(135)(136)(271)(271)
Net periodic postretirement benefit$(127)$(127)$(254)$(252)
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.