Employee Benefit Plans - Changes Recognized in Accumulated Other Comprehensive Loss for Pension Plan (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Amounts recognized in accumulated other comprehensive loss:
Accumulated other comprehensive loss at beginning of year, before tax	$ 10,524	$ 9,245
Actuarial net loss arising during the period	961	1,562
Amortizations (recognized in net periodic benefit cost):
Actuarial loss	(333)	(278)
Prior service cost	(5)	(5)
Total recognized in other comprehensive loss	623	1,279
Accumulated other comprehensive loss at end of year, before tax	$ 11,147	$ 10,524