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Other Assets (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments |  |  |  |
Investment grade corporate and municipal bond held to maturity | $ 114,300,000 | $ 114,300,000 |  |
Interest receivable | 689,000 | 689,000 |  |
Allowance for credit loss | $ 0 | 0 |  |
Purchase of equity investment common shares |  | $ 0 | $ 10,000,000 |
Record Holdings |  |  |  |
Schedule of Equity Method Investments |  |  |  |
Purchase of equity investment common shares |  |  |  | $ 10,000,000
Ownership percentage (percent) |  |  |  | 18.00%

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