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Retirement Plans - Fair Value of Plan Assets by Investment Type (Details) - Pension plan - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11,125	$ 10,435	$ 8,920
Cash and Cash Equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102	70
Collective Funds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11,023	$ 10,365

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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