Employee Benefit Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,915	$ 5,653	$ 7,556	$ 7,647
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,263	1,784
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,652	3,869
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	636	359
Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	636	359
Cash | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Government sponsored entities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,648	2,119
Government sponsored entities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Government sponsored entities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,648	2,119
Government sponsored entities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Municipal bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,792	1,513
Municipal bonds and notes | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Municipal bonds and notes | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,792	1,513
Municipal bonds and notes | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212	237
Corporate bonds and notes | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate bonds and notes | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212	237
Corporate bonds and notes | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,385	1,227
U.S. companies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,385	1,227
U.S. companies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. companies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	242	198
Foreign companies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	242	198
Foreign companies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign companies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0