Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Benefit Plans

Schedule of components of net periodic benefit cost

	Income line item where recognized in	Pension Benefits				Other Benefits
(dollars inthousands)	the consolidated statements of income	2018		2017		2018		2017
Three Months Ended June 30,
Service cost	Salaries and employee benefits	$	174	$	157	$	213	$	179
Interest cost	Other noninterest expense		1,795		2,042		184		201
Expected return on plan assets	Other noninterest expense		(1,239)		(1,242)		—		—
Prior service credit	Other noninterest expense		—		—		(107)		(108)
Recognized net actuarial loss	Other noninterest expense		1,609		1,999		—		—
Total net periodic benefit cost		$	2,339	$	2,956	$	290	$	272
Six Months Ended June 30,
Service cost	Salaries and employee benefits	$	348	$	315	$	425	$	358
Interest cost	Other noninterest expense		3,589		4,083		369		402
Expected return on plan assets	Other noninterest expense		(2,479)		(2,484)		—		—
Prior service credit	Other noninterest expense		—		—		(214)		(215)
Recognized net actuarial loss	Other noninterest expense		3,220		3,998		—		—
Total net periodic benefit cost		$	4,678	$	5,912	$	580	$	545