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Employee Benefit Plans - Status of Stock Options Related to Stock Plans (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options Outstanding Beginning Balance | 33,000 |  |
Options Outstanding Exercised | (33,000) |  |
Options Outstanding Ending Balance |  | 33,000 |
Weighted Average Exercise Price Per Share, Beginning Balance | $ 1.81 |  |
Weighted Average Exercise Price Per Share, Exercised | $ 1.81 |  |
Weighted Average Exercise Price Per Share, Ending Balance |  | $ 1.81 |
Weighted Average Remaining Contractual Term |  | 3 months 18 days |
Aggregate Intrinsic Value, Beginning Balance |  | $ 392 |
Intrinsic value of stock options exercised | $ 426 | $ 3,564 | $ 425
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise Price Per Share, Beginning Balance | $ 1.81 |  |
Exercise Price Per Share, Exercised | 1.81 |  |
Exercise Price Per Share, Ending Balance |  | $ 1.81 |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise Price Per Share, Beginning Balance | 1.81 |  |
Exercise Price Per Share, Exercised | $ 1.81 |  |
Exercise Price Per Share, Ending Balance |  | $ 1.81 |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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