Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Benefit Plans

Schedule of components of net periodic benefit cost

	Expense line item where recognized in	Pension Benefits				Other Benefits
(dollars inthousands)	the consolidated statements of income	2018		2017		2018		2017
Three Months Ended March 31,
Service cost	Salaries and employee benefits	$	174	$	158	$	212	$	179
Interest cost	Other noninterest expense		1,794		2,041		185		201
Expected return on plan assets	Other noninterest expense		(1,240)		(1,242)		—		—
Prior service credit	Other noninterest expense		—		—		(107)		(107)
Recognized net actuarial loss	Other noninterest expense		1,611		1,999		—		—
Total net periodic benefit cost		$	2,339	$	2,956	$	290	$	273