Employee Benefit Plans - Return on Current and Target Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 28,443	$ 23,749
Total plan assets at fair value	7,676	6,126
Pooled funds	20,767	17,623
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	232	153
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,247	3,647
Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2,645	1,475
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,552	851
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	7,676	6,126
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	232	153
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,247	3,647
Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2,645	1,475
Level 1 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,552	851
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 | Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 0	$ 0