Employee Benefit Plans - Other Retirement Agreements (Details) - USD ($)		12 Months Ended
	Mar. 01, 2019	Dec. 31, 2021	Dec. 31, 2020
Split Dollar Life Insurance
Employee Benefit Plans
Beneficiary amount of death proceeds from policies	$ 700,000
Other Retirement Agreements
Employee Benefit Plans
Threshold period of service of employee eligibility for plan		10 years
Threshold age of employee eligibility for plan		75 years
Payments to be made to each director		$ 120,000
Payment period (in years)		10 years
Expense incurred under the plan		$ 31,000	$ 35,000
Accrued liability		310,000	312,000
Life insurance policies
Employee Benefit Plans
Company beneficiary, aggregate death benefits of life insurance		$ 7,210,000	$ 7,192,000