Pension and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Schedule of weighted-average assumptions used to determine pension benefit obligations

Weighted-average assumptions used to determine pension benefit obligations at year end and net periodic pension cost are shown in the table below:

	2018				2017
	Modified Retirement Plan		Funded Plan		Modified Retirement Plan		Funded Plan
Discount rate for disclosures	4.40	%	Various		3.75	%	3.75	%
Discount rate for net periodic benefit cost	3.75	%	3.75	%	4.00	%	4.00	%
Expected long-term rate of return	N/A		4.00	%	N/A		4.00	%
Rate of compensation increase	N/A		N/A		N/A		N/A
Measurement date	12/31/2018		12/31/2018		12/31/2017		12/31/2017

Schedule of changes in obligations and plan assets

United recognizes the underfunded status of the plans as a liability in the consolidated balance sheets. Information about changes in obligations and plan assets follows (in thousands): 

	2018						2017
	Modified Retirement Plan			Funded Plan			Modified Retirement Plan			Funded Plan
Accumulated benefit obligation:
Accumulated benefit obligation - beginning of year	$	21,705		$	17,700		$	19,408		$	18,501
Service cost	363			—			551			—
Interest cost	801			647			778			738
Plan amendments	412			—			699			—
Actuarial (gains) losses	(949		)	(839		)	773			1,291
Benefits paid	(596		)	(1,497		)	(504		)	(2,830		)
Accumulated benefit obligation - end of year	21,736			16,011			21,705			17,700
Change in plan assets, at fair value:
Beginning plan assets	—			14,308			—			16,264
Actual return	—			(216		)	—			874
Employer contribution	596			—			504			—
Benefits paid	(596		)	(1,497		)	(504		)	(2,830		)
Plan assets - end of year	—			12,595			—			14,308
Funded status - end of year (plan assets less benefit obligations)	$	(21,736	)	$	(3,416	)	$	(21,705	)	$	(3,392	)

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

Components of net periodic benefit cost and other amounts recognized in other comprehensive income (in thousands):

	2018					2017					2016
	Modified Retirement Plan		Funded Plan			Modified Retirement Plan		Funded Plan			Modified Retirement Plan		Funded Plan
Service cost	$	363	$	—		$	551	$	—		$	382	$	—
Interest cost	801		647			778		738			740		842
Expected return on plan assets	—		(551		)	—		(630		)	—		(696		)
Amortization of prior service cost	666		—			560		—			501		—
Amortization of net losses	241		—			238		—			167		—
Net periodic benefit cost	$	2,071	$	96		$	2,127	$	108		$	1,790	$	146

Schedule of estimated future benefit payments

The following table summarizes the estimated future benefit payments expected to be paid from the plans for the periods indicated (in thousands). With regard to the Funded Plan, the estimated future benefit payments were determined without regard to termination.

	Modified Retirement Plan		Funded Plan
2019	$	1,142	$	1,083
2020	1,227		1,073
2021	1,221		1,056
2022	1,214		1,058
2023	1,207		1,037
2024-2026	6,755		4,984
	$	12,766	$	10,291

Schedule of funded plan assets

The following table summarizes the Funded Plan assets by major category as of the dates indicated, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands).

December 31, 2018	Level 1		Level 2		Level 3		Total
Money market fund	$	—	$	1,033	$	—	$	1,033
Mutual funds	4,881		—		—		4,881
U.S. Treasuries	4,465		—		—		4,465
Exchange traded funds	2,216		—		—		2,216
Total plan assets	$	11,562	$	1,033	$	—	$	12,595

December 31, 2017	Level 1		Level 2		Level 3		Total
Money market fund	$	—	$	516	$	—	$	516
Mutual funds	526		—		—		526
Corporate stocks	1,346		—		—		1,346
Exchange traded funds	11,920		—		—		11,920
Total plan assets	$	13,792	$	516	$	—	$	14,308