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Share-based Compensation - Options Outstanding (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Additional disclosures |  |  |
Compensation expense recognized | $ 3,800,000 | $ 3,500,000 | $ 2,600,000
Period over which cost will be recognized | 3 years 6 months |  |
Stock option awards |  |  |
Options Outstanding |  |  |
Number (in shares) | 53,185 |  |
Weighted-Average Exercise Price (in dollars per share) | $ 22.00 |  |
Weighted-Average Remaining Contractual Life | 5 years 10 months 24 days |  |
Intrinsic Value (in dollars) | $ 292 |  |
Options Exercisable |  |  |
Number (in shares) | 53,185 |  |
Intrinsic Value (in dollars) | $ 292 |  |
Additional disclosures |  |  |
Compensation expense recognized | $ 100,000 | $ 200,000 |
$10.43-$13.47 | Stock option awards |  |  |
Range of Exercise Prices |  |  |
Low end of the range (in dollars per share) | $ 12.57 |  |
High end of the range (in dollars per share) | $ 13.47 |  |
Options Outstanding |  |  |
Number (in shares) | 7,852 |  |
Weighted-Average Exercise Price (in dollars per share) | $ 13.43 |  |
Weighted-Average Remaining Contractual Life | 5 months 26 days |  |
Options Exercisable |  |  |
Number (in shares) | 7,852 |  |
$17.05 | Stock option awards |  |  |
Options Outstanding |  |  |
Number (in shares) | 308 |  |
Weighted-Average Exercise Price (in dollars per share) | $ 17.05 |  |
Weighted-Average Remaining Contractual Life | 18 days |  |
Options Exercisable |  |  |
Number (in shares) | 308 |  |
$23.53 | Stock option awards |  |  |
Options Outstanding |  |  |
Number (in shares) | 45,025 |  |
Weighted-Average Exercise Price (in dollars per share) | $ 23.53 |  |
Weighted-Average Remaining Contractual Life | 6 years 10 months 17 days |  |
Options Exercisable |  |  |
Number (in shares) | 45,025 |  |

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