Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 30, 2020

Defined Benefit Plan [Abstract]

Components of Net Periodic Benefit Cost

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		Nine Months		Three Months		Nine Months
Periods ended September 30,	2020	2019	2020	2019	2020	2019	2020	2019
Net Periodic Benefit Cost:
Service cost (1)	$541	$510	$1,623	$1,528	$43	$31	$128	$94
Interest cost (2)	626	741	1,879	2,225	116	140	349	422
Expected return on plan assets (2)	(1,135)	(1,124)	(3,404)	(3,371)	—	—	—	—
Amortization of prior service credit (2)	—	(4)	—	(12)	—	—	—	—
Recognized net actuarial loss (2)	396	198	1,187	594	139	104	419	307
Net periodic benefit cost	$428	$321	$1,285	$964	$298	$275	$896	$823

(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.

Schedule of Assumptions Used for Net Periodic Benefit Cost

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 nine months ended September 30,	2020	2019	2020	2019
Measurement date	Dec 31, 2019	Dec 31, 2018	Dec 31, 2019	Dec 31, 2018
Equivalent single discount rate for benefit obligations	3.42%	4.38%	3.30%	4.28%
Equivalent single discount rate for service cost	3.54	4.44	3.62	4.48
Equivalent single discount rate for interest cost	3.07	4.12	2.93	3.98
Expected long-term return on plan assets	5.75	5.75	N/A	N/A
Rate of compensation increase	3.75	3.75	3.75	3.75