Employee Benefit Plans - Defined Benefit Plan Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in Benefit Obligation:
Projected benefit obligation at beginning of year	$ 7,932	$ 8,453	$ 10,710
Service cost	0	0	0
Interest cost	237	269	297
Actuarial (gain) loss	611	352	(100)
Settlement gain	(3)	(51)	0
Benefits paid	(464)	(1,091)	(2,454)
Projected benefit obligation at end of year	8,313	7,932	8,453
Change in Plan Assets:
Fair value of plan assets at beginning of year	7,647	8,428	10,949
Actual return on plan assets	373	310	(67)
Benefits paid	(464)	(1,091)	(2,454)
Fair value of plan assets at end of year	7,556	7,647	8,428
Funded Status at End of Year	(757)	(285)	(25)
Amounts Recognized in the Consolidated Balance Sheets
Other liabilities	(757)	(285)	(25)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial loss	2,886	2,652	2,818
Deferred income taxes	(606)	(928)	(986)
Amount recognized	2,280	1,724	1,832
Components of Net Periodic Benefit Cost
Service cost	0	0	0
Interest cost	237	269	297
Expected return on plan assets	(353)	(385)	(459)
Recognized net loss due to settlement	135	315	671
Recognized net actuarial loss	218	228	293
Net periodic benefit cost	$ 237	$ 427	$ 802