Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans And Incentive Compensation Program (Narrative) (Details)

v3.20.4
Employee Benefit Plans And Incentive Compensation Program (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Employee salary contribution limit $ 19,500    
Employer contribution 87,000    
Employees Over 50 Years [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Employee salary contribution limit $ 26,000    
First 3% Of Employee Contributions [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Percentage employer matches of the employee's percentage contribution matched 100.00% 100.00% 100.00%
Percent of employee contribution 3.00%    
Next 2% Of Employee Contributions [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Percentage employer matches of the employee's percentage contribution matched 50.00%    
Percent of employee contribution 2.00%