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Retirement and Share-based Compensation Plans (Incentive Plans) (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
2016 Employee Incentive 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 | 1,712,924 |  |
2016 Employee Incentive Plan | Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Duration used to measure performance and threshold goals | 3 years |  |
2016 Employee Incentive Plan | Performance Units | 2019 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments granted | 152,678 |  |
2016 Employee Incentive Plan | Performance Units | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments granted |  | 105,617 |
2016 Employee Incentive Plan | Performance Units | 2017 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments granted |  |  | 84,476
2016 Employee Incentive Plan | Performance Units | Threshold Goals, Vesting Percentage | 2019 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 50.00% |  |
2016 Employee Incentive Plan | Performance Units | Threshold Goals, Vesting Percentage | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage |  | 50.00% |
2016 Employee Incentive Plan | Performance Units | Threshold Goals, Vesting Percentage | 2017 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage |  |  | 50.00%
2016 Employee Incentive Plan | Performance Units | Target Performance Goals, Vesting Percentage | 2019 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 100.00% |  |
2016 Employee Incentive Plan | Performance Units | Target Performance Goals, Vesting Percentage | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage |  | 100.00% |
2016 Employee Incentive Plan | Performance Units | Target Performance Goals, Vesting Percentage | 2017 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage |  |  | 100.00%
2016 Employee Incentive Plan | Performance Units | Maximum Performance Goals, Vesting Percentage | 2019 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 150.00% |  |
2016 Employee Incentive Plan | Performance Units | Maximum Performance Goals, Vesting Percentage | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage |  | 150.00% |
2016 Employee Incentive Plan | Performance Units | Maximum Performance Goals, Vesting Percentage | 2017 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage |  |  | 150.00%
2016 Employee Incentive Plan | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
2016 Employee Incentive Plan | Restricted Stock Units | 2019 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Equity instruments granted | 72,696 |  |
2016 Employee Incentive Plan | Restricted Stock Units | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  | 1 year |
Equity instruments granted |  | 85,500 |
2016 Employee Incentive Plan | Restricted Stock Units | Share-based Compensation Award, Tranche One | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  | 3 years |
Equity instruments granted |  | 6,000 |
2016 Employee Incentive 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 |  |
2016 Employee Incentive Plan | Restricted Stock | 2018 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued in period |  | 36,270 |
2016 Employee Incentive Plan | Restricted Stock | 2017 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued in period |  |  | 39,826
2016 Employee Incentive Plan | Restricted Stock | Share-based Compensation Award, Tranche One | 2017 Employee Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  |  | 1 year
Shares issued in period |  |  | 6,727
2009 Employee Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 2,500,000 |  |
Duration of award | 10 years |  |
Award vesting period | 3 years |  |
2009 Employee Incentive Plan | March 2010 Option Grant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Duration of award | 6 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 | 22,900 |  |
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 | 33,000
Maximum | 2013 Director Equity And Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 1 year |  |

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- Definition Item represents the age when participants automatically become fully vested in shares issued under the specified retirement and share-based compensation plan. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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