Post-Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2015

Retiree Medical Plan

Post-Retirement Benefits

Schedule of the plan's funded status and amounts recognized in the Company's accompanying consolidated financial statements

	December 31,
(Dollars in thousands)	2015		2014		2013
Change in benefit obligation:
Benefit obligation at beginning of year	$	436	$	444	$	518
Interest cost		12		15		19
Actuarial (gain) loss		19		24		(41)
Benefits paid		(45)		(47)		(52)
Benefit obligation at end of year		422		436		444
Change in plan assets:
Fair value of plan assets at beginning of year		—		—		—
Employer contribution		45		47		52
Benefits paid		(45)		(47)		(52)
Fair value of plan assets at end of year		—		—		—
Funded status	$	(422)	$	(436)	$	(444)

Schedule of weighted average assumptions used to determine benefit obligations and net periodic benefit cost

	Year Ended December 31,
	2015		2014		2013
Weighted-average assumptions used to determine benefit obligation at December 31:
Discount rate	3.30	%	3.00	%	3.60	%
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate	3.00	%	3.60	%	3.80	%
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year	5.00	%	5.00	%	5.00	%

Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income

	Year Ended December 31,
(Dollars in thousands)	2015		2014		2013
Interest cost	$	12	$	15	$	19
Recognized net actuarial loss		9		6		10
Net periodic benefit cost		21		21		29
Net (gain) loss		19		24		(41)
Amortization of loss		(9)		(6)		(10)
Total amount recognized in other comprehensive income		10		18		(51)
Total recognized in net periodic benefit cost and other comprehensive income	$	31	$	39	$	(22)

Schedule of effects of one-percentage-point change in assumed health care cost trend rates

	One-Percentage Point
(Dollars in thousands)	Increase		Decrease
Effect on total of interest cost	$	1	$	(1)
Effect on postretirement benefit obligation		27		(24)

Schedule of estimated future benefit payments (including expected future service as appropriate)

(Dollars in thousands)
2016	$	42
2017		42
2018		41
2019		40
2020		39
2021-2025		166
	$	370

Retiree Welfare Plan

Post-Retirement Benefits

Schedule of the plan's funded status and amounts recognized in the Company's accompanying consolidated financial statements

	December 31,
(Dollars in thousands)	2015		2014		2013
Change in benefit obligation:
Benefit obligation at beginning of year	$	2,331	$	2,197	$	2,231
Interest cost		77		85		37
Participants’ contributions		—		72		63
Actuarial (gain) loss		(105)		299		(4)
Benefits paid		(233)		(322)		(145)
Less: Federal subsidy on benefits paid		22		—		15
Benefit obligation at end of year		2,092		2,331		2,197
Change in plan assets:
Fair value of plan assets at beginning of year		—		—		—
Employer contribution		233		250		82
Participants’ contributions		—		72		63
Benefits paid		(233)		(322)		(145)
Fair value of plan assets at end of year		—		—		—
Funded status	$	(2,092)	$	(2,331)	$	(2,197)

Schedule of weighted average assumptions used to determine benefit obligations and net periodic benefit cost

	Year Ended December 31,
	2015		2014		2013
Weighted-average assumptions used to determine benefit obligation at December 31:
Discount rate	3.70	%	3.45	%	4.05	%
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate	3.45	%	4.05	%	3.95	%
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year	6.25	%	6.50	%	6.75	%

Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income

	Year Ended December 31,
(Dollars in thousands)	2015		2014		2013
Interest cost	$	77	$	84	$	36
Recognized net actuarial loss		115		96		39
Net periodic benefit cost		192		180		75
Net (gain) loss		(106)		299		(4)
Amortization of loss		(115)		(96)		(39)
Total amount recognized in other comprehensive income		(221)		203		(43)
Total recognized in net periodic benefit cost and other comprehensive income	$	(29)	$	383	$	32

Schedule of effects of one-percentage-point change in assumed health care cost trend rates

	One-Percentage Point
(Dollars in thousands)	Increase		Decrease
Effect on aggregate service and interest cost	$	5	$	(4)

Schedule of estimated future benefit payments (including expected future service as appropriate)

Estimated future benefit payments (including expected future service as appropriate):

(Dollars in thousands)
2016	$	189
2017		190
2018		190
2019		190
2020		186
2021-2025		818
	$	1,763