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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Retirement Benefits [Abstract]    
Automatic Annual Contribution Employees Hired Before January 1, 2009 Benefit Reduction Under Certain Amendments Minimum, percent 5.00%  
Automatic Annual Contribution Employees Hired Before January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum, percent 7.00%  
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009, percent 50.00%  
Maximum annual contribution per employee, percent 3.00%  
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]    
401(k) plan $ 180 $ 160
Qualified noncontributory defined benefit retirement plan [Member]    
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]    
Qualified noncontributory defined benefit retirement plan 308 279
Components of net periodic pension cost [Abstract]    
Interest cost 12 13
Amortization of unrecognized net loss 2 2
Net periodic pension cost 14 15
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [Abstract]    
Net actuarial gain $ (1) $ (2)