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Retirement and Share-based Compensation Plans (Incentive Plans) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted 815,767 0 0
Amended Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of additional shares authorized 3,000,000    
Number of shares authorized 5,500,000    
Number of shares available for future grant 3,485,509    
Amended Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period 51,450    
Amended Plan | Performance Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted 709,958    
Duration of award 5 years    
Period market condition must be met 30 days    
Market condition, weighted average common stock price per common share $ 37.00    
Amended Plan | Performance Options | Share-based Compensation Award, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 50.00%    
Amended Plan | Performance Options | Share-based Compensation Award, Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 50.00%    
Award vesting period 1 year    
2016 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 2,500,000    
Number of shares available for future grant 0    
2016 Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Participant age for full vesting 65 years    
Requisite service period for full vesting 10 years    
Shares issued in period     36,270
2016 Employee Incentive Plan or Amended Plan | Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments granted 217,781 152,678 105,617
Award performance period 3 years 3 years 3 years
Award vesting period 3 years 3 years 3 years
2016 Employee Incentive Plan or Amended Plan | Performance Units | Threshold Goals, Vesting Percentage      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 50.00% 50.00% 50.00%
2016 Employee Incentive Plan or Amended Plan | Performance Units | Target Performance Goals, Vesting Percentage      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 100.00% 100.00% 100.00%
2016 Employee Incentive Plan or Amended Plan | Performance Units | Maximum Performance Goals, Vesting Percentage      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 150.00% 150.00% 150.00%
2016 Employee Incentive Plan or Amended Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity instruments granted 133,429 72,696 85,500
Participant age for full vesting 65 years    
Requisite service period for full vesting 10 years    
2016 Employee Incentive Plan or Amended Plan | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted 105,809    
Duration of award 10 years    
2013 Director Equity And Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 250,000    
Number of shares available for future grant 0    
2013 Director Equity And Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period   32,000 28,600
Minimum | Amended Plan | Performance Options | Share-based Compensation Award, Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Minimum | 2016 Employee Incentive Plan or Amended Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Minimum | 2016 Employee Incentive Plan or Amended Plan | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Maximum | Amended Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Maximum | 2016 Employee Incentive Plan or Amended Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Maximum | 2016 Employee Incentive Plan or Amended Plan | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Maximum | 2013 Director Equity And Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year