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Financing and Other Debt - Amounts Outstanding Under Participation Debt Agreements (Details) - Loan Participations and Assignments - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Debt Instrument [Line Items] |  |
Amounts Outstanding | $ 60,000,000 |
Average interest rate on participation debt outstanding |  | 4.17%
Participation debt |  |
Debt Instrument [Line Items] |  |
Amounts Available | 60,000,000 | $ 80,000,000
Amounts Outstanding | 0 | 50,000,000
Remaining Funding Capacity | $ 60,000,000 | $ 30,000,000

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