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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 |  |

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