Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2020

Supplemental Retirement Plan

Benefit plans

Schedule of components of net periodic benefit cost

	Three Months Ended
	March 31,
	2020		2019
	(Dollars in thousands)
Components of net periodic benefit cost:
Service cost	$	123	$	55
Interest cost		231		264
Amortization of net actuarial loss		85		46
Net periodic benefit cost	$	439	$	365

Split-Dollar Life Insurance Benefit Plan

Benefit plans

Schedule of components of net periodic benefit cost

	Three Months Ended
	March 31,
	2020		2019
	(Dollars in thousands)
Amortization of prior transition obligation	$	(15)	$	(25)
Interest cost		62		70
Net periodic benefit cost	$	47	$	45

Schedule of change in projected benefit obligation

	March 31,		December 31,
	2020		2019
	(Dollars in thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	8,198	$	6,903
Interest cost		62		278
Actuarial loss (gain)		—		1,017
Projected benefit obligation at end of period	$	8,260	$	8,198

Schedule of amounts recognized in accumulated other comprehensive loss

	March 31,		December 31,
	2020		2019
	(Dollars in thousands)
Net actuarial loss	$	3,813	$	3,776
Prior transition obligation		1,037		1,059
Accumulated other comprehensive loss	$	4,850	$	4,835