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Compensation and Other Benefit Plans - Performance-based stock options (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation |  |
Stock-based compensation expense | $ 4,948 | $ 3,902
Unrecognized compensation expense related to stock options (in dollars) | $ 3,500 |
Number of shares, Granted | 438,814 |
Stock Options |  |
Share-based compensation |  |
Threshold years required for retirement age | 70 years |
Stock Options | Employees |  |
Share-based compensation |  |
Vesting period | 3 years |
Stock Options | Directors |  |
Share-based compensation |  |
Vesting period | 1 year |
Stock Options Vesting Based On Performance |  |
Share-based compensation |  |
Number of options outstanding, non-vested options | 41,250 |
Grant date fair value | $ 200 |
Stock-based compensation expense | $ 200 |

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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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