Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit 401(k) Plans (Narrative) (Details)

v3.21.2
Employee Benefit 401(k) Plans (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Minimum employee subscription rate, percentage of compensation     1.00%  
Maximum employee subscription rate, percentage of compensation     60.00%  
Employee pre-tax contributions vested percentage     100.00%  
Vesting rate     20.00%  
Percentage vested after total service period     100.00%  
Employees' vesting rights     Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Company.  
Expenses for employee benefit plan $ 158,000 $ 199,000 $ 496,000 $ 630,000
Minimum [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Employer contribution vesting period     2 years  
Maximum [Member]        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Employer contribution vesting period     6 years