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Employee Stock Ownership Plan - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement [Abstract] |  |  |  |
Initial term of employer loan |  | 15 years |  |
Employer loan, annual interest rate |  | 3.71% |  |
Compensation Expense | $ 2.5 |  | $ 0.9 | $ 2.3

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- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Interest Rate During Period + References No definition available. + Details
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- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Term + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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