Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019 and 2018.

	Three Months Ended				Six Months Ended
	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
(Dollars in thousands)
Interest cost	$	286	$	272	$	572	$	543
Net amortization		52		109		104		219
Net periodic pension cost	$	338	$	381	$	676	$	762