Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2021

Compensation And Retirement Disclosure [Abstract]

Summary of Components of Net Periodic Pension Cost

The following table summarizes the components of net periodic pension cost for the three months ended March 31, 2021 and 2020.

	Three Months Ended
	March 31, 2021		March 31, 2020
(Dollars in thousands)
Interest cost	$	206	$	251
Net amortization		97		72
Net periodic pension cost	$	303	$	323