Summary of Significant Accounting Policies - Life Insurance Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Individual	Dec. 31, 2020 USD ($)
Supplementary Information For Corporate Owned Life Insurance [Line Items]
Number of former employees covered under insurance policies | Individual	16
Average age of former employees covered under insurance policies	78 years
Gross cash surrender values of life insurance	$ 28,300	$ 27,100
Loans on cash surrender value	25,200	24,400
Net cash surrender values of life insurance	4,018	3,587
Gross death benefit of life insurance contracts	36,000	35,000
Life insurance proceeds to be received upon the death of participants	10,400
Life insurance gain to be recognized upon death of participants	7,400
Non-taxable life insurance gain		987
Non-Qualified Defined Benefit Executive Supplemental Benefit Plan [Member]
Supplementary Information For Corporate Owned Life Insurance [Line Items]
Net cash surrender values of life insurance	$ 3,100	$ 2,700