Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Options (Details)

Stock-based Compensation - Stock Options (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Share-based compensation    
Number of shares, Granted 0  
Stock Options    
Share-based compensation    
Minimum age required for employees to qualify for immediate vesting of award   55 years
Threshold years required for retirement age   70 years
Number of shares, Granted   187,811
Stock Options | Employees    
Share-based compensation    
Vesting period   3 years
Stock Options | Directors    
Share-based compensation    
Vesting period   1 year