Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

BancShares Plan

For the three and six months ended June 30, 2018 and 2017, the components of net periodic benefit cost are as follows:



	Three months ended June 30						Six months ended June 30
(Dollars in thousands)	2018			2017			2018			2017
Service cost	$	3,362		$	2,934		$	6,791		$	6,310
Interest cost	7,131			7,069			14,188			14,449
Expected return on assets	(11,976		)	(10,307		)	(23,933		)	(21,005		)
Amortization of prior service cost	20			53			40			105
Amortization of net actuarial loss	3,548			2,193			6,794			4,427
Net periodic benefit cost	$	2,085		$	1,942		$	3,880		$	4,286

Bancorporation Plan

For the three and six months ended June 30, 2018 and 2017, the components of net periodic benefit cost are as follows:



	Three months ended June 30						Six months ended June 30
(Dollars in thousands)	2018			2017			2018			2017
Service cost	$	624		$	670		$	1,286		$	1,341
Interest cost	1,592			1,682			3,179			3,365
Expected return on assets	(3,110		)	(2,796		)	(6,216		)	(5,592		)
Amortization of net actuarial loss	86			214			157			428
Net periodic benefit cost	$	(808	)	$	(230	)	$	(1,594	)	$	(458	)