Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Retirement Plan

Benefit plans

Schedule of change in projected benefit obligation

	2017		2016
	(Dollars in thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	27,376	$	26,287
Service cost		325		534
Actuarial loss (gain)		790		425
Interest cost		1,034		1,035
Benefits paid		(1,015)		(905)
Projected benefit obligation at end of year	$	28,510	$	27,376
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss	$	7,849	$	7,335

Schedule of weighted-average assumptions used to determine the benefit obligation

	2017		2016
Discount rate	3.38	%	3.85	%
Rate of compensation increase	N/A		N/A

Schedule of estimated benefit payments over the next ten years, which reflect anticipated future events, service and other assumptions

	Estimated
	Benefit
Year	Payments
	(Dollars in thousands)
2018	$	1,085
2019		1,592
2020		1,604
2021		1,648
2022		1,814
2023 to 2027		9,970
	$	17,713

Schedule of components of net periodic benefit cost

	2017		2016
	(Dollars in thousands)
Components of net periodic benefit cost:
Service cost	$	325	$	534
Interest cost		1,034		1,035
Amortization of net actuarial loss		276		239
Net periodic benefit cost	$	1,635	$	1,808

Schedule of assumption used to determine the net periodic benefit cost

	2017		2016
Discount rate	3.85	%	4.00	%
Rate of compensation increase	N/A		N/A

Split-Dollar Life Insurance Benefit Plan

Benefit plans

Schedule of change in projected benefit obligation

	2017		2016
	(Dollars in thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	6,301	$	6,215
Interest cost		243		248
Actuarial (gain) loss		167		(162)
Projected benefit obligation at end of period	$	6,711	$	6,301

Schedule of weighted-average assumptions used to determine the benefit obligation

	2017		2016
Discount rate	3.38	%	3.85	%

Schedule of components of net periodic benefit cost

	2017		2016
	(Dollars in thousands)
Amortization of prior transition obligation	$	(71)	$	(51)
Interest cost		243		248
Net periodic benefit cost	$	172	$	197

Schedule of assumption used to determine the net periodic benefit cost

	2017		2016
Discount rate	3.85	%	4.00	%

Schedule of amounts recognized in accumulated other comprehensive loss

	2017		2016
	(Dollars in thousands)
Net actuarial loss	$	2,453	$	2,126
Prior transition obligation		1,238		1,328
Accumulated other comprehensive loss	$	3,691	$	3,454