Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

Benefit Plans

Schedule of components of net periodic benefit cost

	Pension Benefits				Other Benefits
(dollars inthousands)	2017		2016		2017		2016
Three Months Ended June 30,
Service cost	$	157	$	214	$	179	$	192
Interest cost		2,042		2,157		201		211
Expected return on plan assets		(1,242)		(1,164)		—		—
Prior service credit		—		—		(108)		(107)
Recognized net actuarial loss		1,999		1,774		—		—
Total net periodic benefit cost	$	2,956	$	2,981	$	272	$	296
Six Months Ended June 30,
Service cost	$	315	$	429	$	358	$	384
Interest cost		4,083		4,314		402		421
Expected return on plan assets		(2,484)		(2,335)		—		—
Prior service credit		—		—		(215)		(214)
Recognized net actuarial loss		3,998		3,545		—		—
Total net periodic benefit cost	$	5,912	$	5,953	$	545	$	591