Employee Benefit Plans - Plan assets using fair value hierarchy (Details) - Retirement Income Plan - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Investments measured at Net Asset Value	$ 0
Investments at Fair Value	35,339	$ 39,068
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	444	736
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	34,895	38,332
Investment
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	35,339	39,068
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	444	736
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	0
Level 1 | Investment
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	444	736
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	0
Level 2 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	34,895	38,332
Level 2 | Investment
Defined Benefit Plan Disclosure [Line Items]
Total Assets in the Fair Value Hierarchy	$ 34,895	$ 38,332