Retirement Plans (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2021 and 2020.

	Three Months Ended				Six Months Ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
(Dollars in thousands)
Interest cost	$	206	$	251	$	412	$	502
Net amortization		97		72		194		144
Net periodic pension cost	$	303	$	323	$	606	$	646