Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Supplemental Retirement Plan

Benefit plans

Schedule of components of net periodic benefit cost

	Three Months Ended
	March 31,
	2017		2016
	(Dollars in thousands)
Components of net periodic benefit cost:
Service cost	$	81	$	133
Interest cost		259		259
Amortization of net actuarial loss		69		60
Net periodic benefit cost	$	409	$	452

Split-Dollar Life Insurance Benefit Plan

Benefit plans

Schedule of change in projected benefit obligation

	March 31,		December 31,
	2017		2016
	(Dollars in thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	6,301	$	6,215
Interest cost		61		248
Actuarial gain		—		(162)
Projected benefit obligation at end of period	$	6,362	$	6,301

Schedule of amounts recognized in accumulated other comprehensive loss

	March 31,		December 31,
	2017		2016
	(Dollars in thousands)
Net actuarial loss	$	2,166	$	2,126
Prior transition obligation		1,306		1,328
Accumulated other comprehensive  loss	$	3,472	$	3,454

Schedule of components of net periodic benefit cost

	Three Months Ended
	March 31,
	2017		2016
	(Dollars in thousands)
Amortization of prior transition obligation	$	(18)	$	(13)
Interest cost		61		62
Net periodic benefit cost	$	43	$	49