Defined Benefit Pension Plans

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Defined Benefit Pension Plans

Defined Benefit Pension Plans Washington Trust maintains a qualified pension plan for the benefit of certain eligible employees who were hired prior to October 1, 2007. Washington Trust also has non-qualified retirement plans to provide supplemental retirement benefits to certain employees, as defined in the plans. The defined benefit pension plans were previously amended to freeze benefit accruals after a 10-year transition period ending in December 2023.

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 Plan				Non-Qualified Retirement Plans
	Three Months		Six Months		Three Months		Six Months
Periods ended June 30,	2023	2022	2023	2022	2023	2022	2023	2022
Net Periodic Benefit Cost:
Service cost (1)	$350	$515	$701	$1,031	$39	$55	$78	$109
Interest cost (2)	887	592	1,771	1,184	177	106	353	212
Expected return on plan assets (2)	(1,148)	(1,158)	(2,295)	(2,317)	—	—	—	—
Recognized net actuarial loss (2)	—	255	—	510	60	173	119	346
Net periodic benefit cost	$89	$204	$177	$408	$276	$334	$550	$667

(1)Included in salaries and employee benefits expense in the Unaudited Consolidated Statements of Income.

(2)Included in other expenses in the Unaudited Consolidated Statements of Income.

The following table presents the measurement date and weighted-average assumptions used to determine net periodic benefit cost:

	Qualified Pension Plan		Non-Qualified Retirement Plans
For the six months ended June 30,	2023	2022	2023	2022
Measurement date	Dec 31, 2022	Dec 31, 2021	Dec 31, 2022	Dec 31, 2021
Equivalent single discount rate for benefit obligations	5.54%	3.00%	5.50%	2.89%
Equivalent single discount rate for service cost	5.60	3.11	5.61	3.16
Equivalent single discount rate for interest cost	5.43	2.67	5.40	2.48
Expected long-term return on plan assets	5.25	5.25	N/A	N/A
Rate of compensation increase	5.00	3.75	5.00	3.75