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Benefit Plans - 401(k) Savings Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
401(k) Savings Plan |  |  |
Maximum discretionary contribution matched by employer for each employee's contribution | $ 3,000 | $ 3,000 |
Contribution expense | $ 942,000 | $ 934,000 | $ 749,000

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- References No definition available. + Details
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